Was it rape?

He wanted sex. I said no. He shoved me onto his bed and pulled my pants down enough to trap my legs together and started having sex with me even though I kept telling him "stop" and "no". Eventually I just laid there and waited for him to finish.

I feel like because I said no that it WAS rape but because I gave up and was laying there and he gave me an orgasm it wasn't. This happened a couple years ago but it still bothers me.