I was so excited about being pregnant, I'm 5 months...

Now I feel so sad about it..I don't even wanna go through it anymore (but I am)

I don't know who the father is..

I had sex with a guy the day of my period..then got my period a few hours after.

Then the day of my ovulation I had sex with my now current boyfriend and I was certain it was his, but I've been reading about it and now it says I could get pregnant on my period...i just want an opinion my period is normal.28 day cycle.