What Could Be The Cause Of Delayed Periods Post Unprotected Sex And Negative Pregnancy Test ?

Hi, ok soo I had unprotected sex with my boyfriend right when my period of last month just finished and then again like 2 days later, he pulled out both times before he ejaculated, I haven t gotten my period and I was due on the 5 of Feb and its the 7 of Feb now, (I don t have regular cycles) I took a home pregnancy test and it came out negative but I still don t see my period coming. I don t have any symptoms of pregnancy and I been feeling some what bloated but not really kinda like when my period would come, I m getting really worried I don t know what s going on.