My boyfriend and i had unprotected sex on august 22. He didnt fit his whole tip in, he did not ejaculate in me but he ejaculated approximately 30 min-1hr before. My hymen is not broken but im not using any birth control pills. Its the day after and i think i am experiencing implantation bleeding, slight cramps and light coloured bleeding. Could i use morning after pills? My period was supposed to be on august 18 but it didnt happen.