Is There Any Chance Of Pregnancy After Having Unprotected Sex?

Hi I wanted to know if there is a possibility of pregnancy, my last period was on January 27th 2015 and in Febuary 7th hade sex with partner ejaculated inside and mid February around 15th having unprotected sex and my partner ejaculated inside for the second time well a few days after that I started cramping (not normal for me) then there was two occasions that I felt realy dizzy from nowhere, With all of this happening I started feeling sore breasts way before my period which is not normal, then I was having creamy discharge no odor, no itching, but a week before my due period me and my partner had sex and he said to me that the inside of my vagina was really hot. My period supposed to come at the end of Febuary but it came 2nd of March but light period came at first it was brown as if my period ended and then afterwards very very light (NOT normal) My periods are very heavy which I have to change numerous times a day but not this time, I truly feel pregnant something in me just feels different but i can t pinpoint it.