do you think I could be pregnant??

I am on the birth control pill (combo pill). My boyfriend and I have had sex nine times this week. We check the condoms after sex by filling them with water. He said that the condoms were all good and there were no holes whatsoever. He never ejaculates inside of me and always pulls out. I am supposed to start my period Tuesday or Wednesday. I always get super anxious during this time due to PMS. My nipples are also sore, but I think that is PMS also.  Are we being safe enough and do you think I am overreacting?