I've never been pregnant so I might not be the best person to answer your question but everyone on this board will give you the same answer. Get tested.
That is the only way you will know. Go to see your doctor for a pregnancy test or buy one of those pregnancy test kits.
I know you are probably feeling really uncertain and nervous and everything will seem like a sign of pregnancy to you. So get tested and put your mind at ease.
You might also like to see your gynaecologist regarding contraception. If you are having sex on a regular basis without contraception, it is probably only a matter of time before you really do get pregnant.
When a poor person dies of hunger, it has not happened because God did not take care of him or her.
It has happened because neither you nor I wanted to give that person what he or she needed.