Haven't had sex, pregnant?

I haven't had sex in over a month. I have had my menstrual cycle since the last time I had sex. I had protected sex (the condom didn't break and he pulled out before he came) 3weeks Before my last period which ended two days ago (7 days, heavy bleeding w clots) but today when I wiped I had some slight pinkish mucus on the paper, this happened last month(only once) also, I've also been having mood swings today and been tired. Could I be pregnant even though I haven't had sex since my last period