Will she become pregnant from you ejaculating ON her body?
Does the fact that she "feels weird" from sex last night mean she is pregnant?
Is there a possibility that you could have gotten her pregnant last night?
Yes (and from your posting this may be too hard for you to understand) BUT if you ejaculated shortly before your encounter with her AND there was still sperm in your urethra AND you produced pre-ejaculate while inside her it is possible that you may have pushed some of this sperm out with the pre-ejaculate.
However, there is no way in the world she would yet feel any symptoms of pregnancy from an event last night.
And ignore to troll 260879; they've been let out of cellar and have been posting stupid remarks all over WebMD today.
You do need to discuss why your partner seems to need to be so violent during sex with you to the point where he gets sexual pleasure from seeing you physically hurt. Something is very wrong with this relationship.
Perhaps it would help for you to become a stronger person in all dealings with him. You sound like you are attempting to make the first step to be stronger by postponing your wedding and telling...not asking...him to treat you more gently during sex.