Am i pregnant? Just hormonal imbalance!

Hi I am a 23 year old female, I have been sexually active from a few months on October 24th i had unprotected sex with my partner but he did not ejaculate inside me, just to be safe a took a morning after pill within 24 hours. I got my periods a week though it wasnt due for 3 more weeks.i got it on November 2nd. After that i had only protected sex a few times in the 2nd week on November. But on day while wearing the condom my partner realised he was wearing it wrong and immediately removed and wore it properly. since i had my last period on 2nd November i was expecting my periods on 2nd December but it did not happen. A week later i saw some blood and thought it was my periods but it was not as heavy as usual it was lighter, bright red blood which lasted for 6 days. Now i am experiencing little pain in my nipple when i touch them. I have taken 6 home pregnancy test till now and all have come negative. please tell me is i am pregnant or if its just hormonal imbalance