What Causes Delay In Periods, Diarrhea, Headaches And Bloating?

Hi. I am 27yrs old and think i may be pregnant. my period is due in 2 days but I just tested negative on a test. I had unprotected sex 4 or 5 days before I ovulated. about 7 dpo i started having nausea, diarhea off and on, slight headaches and bloated. Cramping as well. Is there a possiblility I could still be pregnant?