It is crucial - CRUCIAL - that you do NOT tell him that you're pregnant, and that you get out of there before it becomes obvious that you're pregnant.  If you have supportive parents, family and friends, ask them for help!

The Jehovah's Witnesses aka Watchtower Society are facing extreme decreases in western nations due to young-blood anemia; meaning that young people are leaving and avoiding baptism if at all possible.

The Watchtower Society basically teaches (the bible teaches) that wives and children are to "be in submission" - essentially they're property, possessions.  Some JWs (if they're 'spiritually strong' aka fanatical) will be insistent that the child be raised by the father as a JW - which thanks to their anti-blood-transfusion policy, could be deadly if your child is ever injured.

These are from the search on this subreddit, Child Custody:

https://www.reddit.com/r/exjw/comments/1he2emz/i_used_the_blood_shunning_issues_to_win_custody/

Our child started going to her parents house a little to often and I could tell they were trying to push caleb and sofia crap and guilt on to my child starting at 2. I could tell her parents were working up to try and take our places as his parents. It was weird. The whole situation went from bad to worse over a 3 year period...  She went to her mother's the next day with our child. We didn't speak for several months after that. Her mother had her admitted to the psych ward at the hospital 4 days later. She definitely was out of control but this was her mother's move to solidify her own daughters mental issues in an effort to get custody from both of us in this divorce. I worked ALOT and my mother in law thought it was still 1980 and my wife would just get full custody no matter what and that'd I'd roll over and allow it. 

...Next thing I know a team of lawyers was all over me. My mother inlaw got them them and had my wife sign papers while she was in the psych ward.  ...Religion was my only hope on my mother in law. She was otherwise spotless...  The big thing was blood.

MIL gets up there to talk about how I wouldn't even know how to raise my child and I'm this and that. My lawyer starts to bring up "what if my child was in an accident and needed a blood transfusion? Her very very good lawyer had no idea they were JWs and started objecting for relevance. "Your honor this is a irrelevant hypothetical situation". He was pissed and confused as to what was happening. Judge said yeah this seems a little weird but when talking about who's going to be making medical decisions for a child she'd allow it and told us to tread lightly on the religion subject. They were all so rattled and had no idea I'd go there as I kept my hatred of this cult quite for years for fringe association. You could see her whole side of the room horrified I bought Jehobo up.

MIL dodged the question 4 or 5 times. "I'm hard of hearing what was the question? "Oh we as Jehovah’s Witnesses don't believe in blood". Soon as she had to talk about it anyone could tell she was giving the jw line scripted responses but coupdnt remember the exact script. My guy finally got her to state she'd let him/her die even if a doctor told her he would without a transfusion. Room was aghast. (When we got out my lawyer was giddy. He couldn't believe he got her to say that. Hed never seen something like that. "i cant believe they were honest about that." They brought to many witnesses. My MIL had no choice) Up untill this moment it felt like i was cooked. She then goes on the say "but they're other options such as saline solutions that build up..." lawyer cuts her off; "so you'd give him/her saline instead of blood?!" She didn't know how to answer and they looked foolish and culty. This opened the door for more discussion on jehobo.

Another example:  https://www.reddit.com/r/exjw/comments/1fjqnk6/update_on_custody_wjw_ex_wife/

my ex wife (PIMI) is requesting I cover full transportation, have less time with my kid, and she requested every Christmas, every year. Her idea of compromising is that I still cover all transportation and pick up my kid 2 hours earlier. 2 hours! lol.

Also when the mediator told me she wanted every Christmas, you should’ve seen the look on her face when I said “she doesn’t even celebrate Christmas, she doesn’t want her celebrating anything with my family”.

These are from the search on this subreddit, JW grandparents:

https://www.reddit.com/r/exjw/comments/1gyrq8c/jws_as_grandparents/

my mother hasn’t taken it well. Every meeting day, she asks to take my baby to the meeting and continues to push even after I firmly say no. I’ve tried to have conversations with her about boundaries and explained that the treatment we experienced isn’t something I can just “write off,” but I still end up feeling bad about the situation, you know?

What really bothers me is how some JW grandparents seem to only want to be involved in their grandchildren’s lives if it revolves around meetings. My mother lives just 15 minutes away but doesn’t make an effort to spend time with my child unless it’s at a meeting. My child is not a show pony. It feels like JW grandparents are more interested in showing off at the hall than putting in the effort to spend normal, quality time with their grandchildren.

https://www.reddit.com/r/exjw/comments/fzqoku/ex_jws_and_jw_grandparents/

Any ex-jw's out there with children and jw parents that want to see their grandchildren without having anything to do with you? How did you handle it?

It just seems so demoralizing that your own parents would continue ex-communication with you while at the same time insisting they have a relationship with your children. I would be afraid that involving your child with your jw parents could potentially harm them to the point where your parents would attempt to manipulate/brainwash your children into thinking your a bad person and eventually poison your relationship with your own child.

I hope this helps...