Over thinking

Maddi
Okay so I've had sex a few times this month, a few times without a condom too, but without him actually finishing. I've been on the pill for 2 years. I'm due for my period now, it takes about 3 or 4 days to come in when I start taking the sugar pill, Is it normal to always have that worry that pregnancy is around the corner? Am I just over reacting?