Maybe pregnant?

My last period was at the end of September and I had unprotected sex like a day after my period ended and then a few days after I’m on birth control but while on the period it’s just the sugar pills and then a week and a bit I noticed that I had missed some pills on my new birth control pack, past week and a half I’ve been nauseous and my skin is breaking out so bad, I’m having really bad food aversions my next period is due in 13 days. I’ve taken two tests both were negative, my pregnant friend said it might be too early to test still because she tested negative 2 times before positive. I’m waiting for my period… I don’t know has anyone else been in a similar situation? I was also using the cheap dollar store tests i don’t know if there’s a better test to buy?