im at a young age. i had a baby eight months ago. my periods were never on time. when i got pregnant i had my period for the first 5 months of my pregnancy and they were all on time. I never once had any problems with my pregnancy but yes i had my period for the first 5 months of my pregnancy, i think it all depends on your body to be honest. and my baby came out perfectly healthy even tho she was born two days before a month from her due date. She was at a low birth weigh but im not sure if that had anything to do with me having periods the first 5 months or not.