Unusual period?

I missed my period last month and recently this month I started “bleeding” so I expected it to be my period (which only lasted 4 days mind you) but the last few days I was on it, it was very very light, mostly spotting. Me and my hubby have unprotected sex a lot.. tmi yes I know sorry! Could my period just have been weird like this due to missing my last one? Or implantation bleeding?? Please comment opinions!!