I had unprotected sex sunday,stopped before finishing,took the morning after pill,started my period the next day,its slower today,could i be pregnant?

Unlikely and too: soon to know. It is unlikely that you are pregnant. However, if you miss your next period, do a pregnancy test. If the result is negative repeat the test 4-5 days later unless you get a period by then. Use first morning urine and follow the instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex. Get HPV vaccine.