HELP AM I PREGNANT

Basically I’m on a combined pill and I missed it on Sunday ( I didn’t realise I missed it so I thought I was protected) on Tuesday night I had sex with my boyfriend and he cummed in me (im 16, he didn’t pull out in time) I am very very scared I could be pregnant and have started Experiencing some slight bleeding. I’m really confused on what this could be as I never have spot bleeding on my pill. Help