antibiotics while pregnant

Natasha
Hey all! 
This is my second pregnancy, and I've had to be on antibiotics a lot. My doc has assured me they're safe and the outcome of I didn't go on them would be much worse. I'm just wondering if any other moms have had to go on them while pregnant and their child is ok? I've heard about antibiotic and autism. Autism scares me, it's my biggest stress. Thank you!