I had sex about a week ago and it was unprotected, I start my period in a week and i have very bad strep throat. I'm taking amoxicillin for my strep throat, I've only ever taken it once when I was about 8. I just looked at my boobs and they have gotten darker. Is there anyway me being sick could have caused this or is there a very good sign I'm pregnant? My boobs are not sore at all, they feel normal, the only difference is the color. I peed a lot yesterday but I did drink more than usual. I did not notice any color differences until today and I started taking amoxicillin yesterday