My bleeding looks like my period but my period...

Hi there.
I don't know extactly when I ovulated, I had my period 19th May and it ended 23rd of May, I had unprotected sex with my boyfriend on the 2nd of June, but the 1st of June I had this brown red but very light of colour, and it was thick, I don't know if I ovulated June 1st, but me and my boyfriend had unprotected sex on the 2nd of June, and the day after I experienced bleeding and later I got cramps on my right side where you usually feel ovulation cramps. My bleeding looks like my period but my period isn't due till plus minus 3weeks. And It's been day two and I'm still bleeding and getting cramps in the middle and a little bit to the left of the middle of my lower abdomen.. It stings a bit.. Could I be pregnant? Please Help! Thank you..