How can I be sure that I'm pregnant?
Take a test! lol But it usually depends on when your last period was and when the last time you had sex. Other than that you can look up symtoms on the net to see if you have any, but with that said you could also have some symtoms because you are worried, meaning your mind is taking over your body. Your best bet is to just take a test. If you take an over the counter test take two just to be sure you get the same reading. If it comes out positive go to the doctors!
you can get either ablood test at the doctors or a pregnancy test
also, symptoms will probbably tell you that you are in a few weeks
youll fell more sick, crave different foods, ect
also some things can make you less fertile or infertile
if you have chlamidia and dont get it checked that can make you infertile
and exessive drinking and smoking can make you less fertile
Take a test and/or see a doctor.