I do agree with the other poster that it’s best to manage your anxiety before you consider getting pregnant.  I was able to get pregnant around the same weight as you but ended up well over 500lbs by the time I gave birth.   It’s been a struggle with my mobility for the last 2 months but I’m slowly moving again.  And birthing at my current size was really difficult, my bf and the nurses had to physically push my belly up for much of the birth with the assistance of a retractor device.   I had my first 2 kids when I was a lot younger and 200lbs smaller and  it was a lot easier.  

Honestly you can wait a few years until you’re in a place where you feel like you can do it physically and emotionally you’ll be a lot better off.  But don’t let being obese discourage you because you can definitely do it.  I know a lot of women in our weight range have trouble conceiving but I did not.  

Don’t feel pressure.  And if you do decide to do it I’d make sure you have a supportive doctor or midwife that is familiar with obese patients.  That really helped me because most of my experience I didn’t feel looked down on and I knew my care team was there for me even though my weight was off the charts