Hello. I'm 18 years old and recently became sexually active. I am on birth control. He never came inside me, and hardly ever goes all the way because I'm extremely sensitive. We had sex on the 24th of February. On March 1st, I missed my birth control pill and the next day I started have brown discharge. Its been off and on spotting everyday since...so it's been 13 days. According to ovulation calculators, I was supposed to have my prime ovulation day on March 1st (I started my period February 15).  Also according to many websites, implantation bleeding is supposed to only last a few days, so should I rule that out? Do you think I've been having this lengthy discharge due to the missed pill...or that I'm pregnant...or something more serious?