Last month my periods were 4 Days early and they ended in 4 days instead of the usual 6-7 days. I have revently started using tampons. Then on the 6th day i had sex and used condoms the whole time. But while having sex i started bleeding from my vagina again. We stopped having sex, the condom was thrown away and it was intact. Then i kept bleeding for 3 days. Then I didnt have sex for the remainder of the month, just made out about 4 times with no vagina-penis contact. A month after my periods started I had 3 days of partying so I consumed a good amount of alcohol but my periods were no where to be seen. Now my periods are 4 days late and im still debating whether I should take a pregnancy test. I would like to know why my periods are delayed as I did not have sex. And what else could be the reason.