It's very possible that you could still have your period and be pregnant. You will need to be alarmed if you miss the next period. If you are afraid you might be preggers you can take an EPT test when this months period is 4-5 days late and it could give you some early answers. Keep in mind...
If at any time during the sex you expressed NO or STOP and he didn't.... Then it's a sexual assualt. It's possible the guy didn't understand fully that you were in pain, but NO means NO.