Confused/Scared help

I'm on the 4th day of my placebo pills and nothing. I'm sexually active, but we also use condoms. The only time we didn't use condoms was on May 23rd. He pulled out. I take my pill everyday at the same time. I've never missed one. We also had sex on the 9th and 11th of this month. With condoms... We had sex yesterday with condoms too. I tested two days ago, because I was feeling very nauseous and my boobs were hurting. It came out negative. Can someone help me out here? I can't be pregnant.