First Signs Of Pregnancy

I had sex like two weeks ago and it was unprotected. I could say that it was a “safe” day for me but still I cant rely on the calendar method 100%. I don’t feel anything different but what are the common first few signs of pregnancy?
Im just 18 btw=)

I had sex last thursday… and this morning i looked up my ovulation calendar and i was around that time. what are some very first signs of pregnancy?