Can you get your period while pregnant?

I have heard of some people having there peroid while they are pregnant. Me and my so had unprotected sex.Im not on birth control or anything I would be Ecstatic to be pregnant but we are not neccesarily trying.I had my peroud so I thought on im not pregnant but latly ive been feelikg sick.Randomly getting these weird pains in my cervicx and it being so bad i have to sit in the bathtub.I also have always kind of had that "pregnancy line up to your belly button but its been alot darker lately and ive been bloated.My stomach stays upset.I cry all the time.basically my question is has anyone expirenced pregnancy after they have gotton there peroid (just to be clear I did not have sex after my period only about a week or 2 before).Thanks!