PREGNANT? SPOTTING. LATE PERIOD. HELP

I had sex Saturday August 21&sunday the 22nd)unprotected but I am 95% sure no cum was in me. I wasn't ovulating either. It did hurt a bit due to his size, and on Tuesday I started spotting until Thursday. Could it have been implantion? Or was it too soon? My period is two days late now. Could the spotting have been my period last week?? Too soon for implantion. I'm only 16. Help