I recently had protected heterosexual sex with a man originally from South Africa but who has lived most recently in New Zealand, Australia, and the US. Before we had sex he entered me with his tip once without a condom. Then he pulled out and put the condom on. When we were done I realized the condom was hanging out of me. It wasn't completely inside just the tip of it was. He says he has tested negative for HIV and other std's. Is my risk of HIV infection high from the two incidents that happened with him?