Am I pregnan,what are my chances of becoming pregnant?

Patient: Could I be pregnant? Last friday I took 2 pills of an antibiotic because I had my wisdom teeth taken out that day. 2 days later I had unprotected intercourse and used the pullout method. I also had unprotected intercourse the next day and again, use the pullout method. I am currently on the pill, and I was wonder what my chances of becoming pregnant are. He did NOT ejaculate inside me, but there is the possibility of pre seminal fluids. Also, this occurred during my “fertile” week and I was supposed to have ovulated yesterday.