Was it my period?

I’ve been on the pill for many years, never missed and never late. This month I’ve had sex about 5 times, each time he’s pulled out. Today when he pulled out I was bleeding quite a bit, so I put in a tampon and there wasn’t too much blood on the tampon. I’m due to start my period in a day.. and I’ve been nervous about being pregnant this month for some reason. I guess because I haven’t been sexually active in a while. This is my period right??