me and my boyfriend had unprotected sex the day before i had started my period the bleeding seem normal to me but it was 3 days shorter now a week latter i am having small cramps i feel sick both headaches and nausea the area around my nipples sometimes look darker but other times they don't and i also been more sleepy then normal as well i don't know what to think about it and to be honest i'm a little bit scared because i'm only 19