I had unprotected sex may 6. He Cam in Me. Most Ferrtile May 3. Period May 17. It came on. But it's a very light flow. Its not enough to fill up a pad. I still be having cramps since my period started.. Its Brownish/Redish Color. With small clots. Is it my period or implantation

Only way to know would be to try a pregnancy test. Since your period is off from the norm, wait a few days and see if anything changes. If still no period like you are used to, try a test. Be sure to follow the directions carefully.

If you did happen to ovulate on May 3 (which only way to know for certain would be with medical assistance), you could not have gotten pregnant from sex on May 6. It would have been too late.

Wait and see what happens over the next several days. It could just be an off period... which can happen.