I had D&C surgery on may 26 and I had sex 1 week later. I had a normal period at the end of june but I didn't have one in July about a week into august I had my period and a week after it stopped I started bleeding again for about 3 days then it stopped again September came and I just started my period on the 18th but I been having unprotected sex on a regular bases. Could i be pregnant or could it be from when I was on the patch I stop putting them on about 1 month and a half ago.