I'm not pregnant right.?

I am on the birth control pill (combo pill). I had a period last month. 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. So far, we have never had a condom break. 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. I'm always afraid I'll be late.  My nipples are sore and I sometimes have light cramps. I've also been pretty emotional. Are these signs of PMS? I'm 18. Are we being safe enough and do you think I am overreacting? 

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