late period?

I'm 2 weeks and 3 days late for my period. all pregnancy tests I've taken have been negative. I haven't took one since 2 days ago. I've been having pressure head aches and diarrhea and now I'm constipated. lower back pain and peeing alot. I only feel nuseaus after I eat something. Boobs having been achy and I feel like I'm getting a cold and also I've been having cramps. has anyone else had this happen to them and still be pregnant? please comment with advice! thanks! is my period gonna come or do you think there is a possibility of me being pregnant?