I had unprotected sex about 4 weeks ago... he pulled out for sure so I know he didn't cum in me. but I'm still worried cause I'm only 16 and I know there's possibilities of getting pregnant from precum but my last period was in December cause my 3 month birth control plan and I don't get my next one until midway March. but ever since I had sex I've been having a dark brownish spotting when I wipe only but now im starting to bleed lightly even when I don't wipe. i need help or advice! I'm just so confused and worried!