Is there a chance i could be pregnant?

[Jackeline124]

early Nov a week before my period was due i started getting very dark brown almost black blood but the texture was a bit different that lasted for three days and i would only have that discharge once a day nothing like my normal periods. The about two weeks AFTER my missed period i got what i think is my period but it was much more heavier than normal i bled thru about 3 different jeans and that has never ever happend to me and this blood was bright bright red with a pinkish undertone and my period blood is usually a darker red. The first time i thought it might be implantation bleeding but if i was never pregnant why would i get my period twice in one month? In oct i was very sexually active and we never used a condom he would always pull out we only used one when i was ovulating. If it helps im 20 and have never been on anh type of BC pill...anyone else with a similar story? Please help!