i last got my period around ap.18 and it ended around the 22th. than i had unprotected sex after a night of drinking on the 22nd i had unprotected sex. it was really rough and i started bleeding after, it stopped but than a 3 days later i started getting these brown/pink discharge for a couple of days. oh i might add i'm on birth control. but i've been forgetting to take the pill since the start of this pack due to a chaotic schedual (i'm a senior in high school). but it doesn't stop there. i than had sex on may 5, we used a condom the first time and he cummed, but the second time we didn't use one but he didn't cum. and to continue. i had unprotected sex on the 11th this month and he cummed inside me. but previously i had forgotten to take my pill for about 3days. and now about two days later i have these brown/pink spots and they're very light. i don't understand whats going on with my body. i should be getting my period in the next week but i don't have any of my usual signs, which never happens.

would someone be able to enlighten me on what might be going on inside me?