I need advice

So I had sex about 13 and 14 days ago. I’m on the pill and take it perfectly. My boyfriend wears a condom and always pulls out. I checked the condoms with water after we were finished and nothing leaked out. I don’t know why I’m so worried but I am. It’s weird cus I have no symptoms but all of a sudden when I was shopping for dinner I got to wear I wasn’t hungry and now I just feel weird like I don’t want to eat. Could I be pregnant? I took a pregnancy test and it was negative. I start my placebo pills on Sunday, but I don’t know when my period is actually going to start because last month I had such a crazy cycle that I ended up changing my dosage and my doctor suggested that I skip my period all together last month