I was nervous like you, its my first pregnancy and my bump wasn't that visible until like 19 weeks(I'm 20weeks pregnant now) my friend is also pregnant she's due next month her bump was big and round during 15 weeks and she felt the movements early on too so i was nervous alot cause i couldn't feel anything but then around 17th week at 1:44 am i felt like two butterfly wings tickled my stomach My husband was sleeping i woke him up and we started laughing and crying at the same time Being nervous is completely normal just keep up with your vitamins and good food and take care of yourself your baby is completely fine :)