AF due 27th but already spotting

Well ladies I am kinda confused with my period this month. AF is due on the 4th with site but on another site it's the 1st. I usually start spotting a couple days before my period each month, so that would put me on the 27th or the 28th this month. Well I already started to spot today which makes me believe I am a few days early or a week early. Just to let you know I don't think I am pregnant but than again I just don't know. The reason why I say that is because my husband and I had sex twice in my fertile window and he didn't cum once inside me. So at that moment i knew I couldn't get pregnant this month. So no stressing at all until I started to spot this today. And now I am wondering if I could be. My periods on regular. I am just confuse?????😕