She didn't let me pull out?

My girlfriend and I've been together for 3yrs.
Yesterday while we were having intercourse I even told her I'm gonna nut. But she just wrapped her legs around me and didn't let me pull out.
She says she's on birth control and I THINK THATS A BIG LIE.
Why tf would anyone do this?
I'm so scared she might get pregnant and I dont want a child.
She didn't let me pull out?
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