did you have unprotected sex? Did
your partner ejaculate inside you? Only time will tell. If you skip
your next monthly visit and you're feeling tired, a little queasy, spotting a little (which can mean implantation) your breasts may feel a little sore (mine sure did)
Take a pregnancy test if you miss your next period. If you take it too soon, it may come out a false negative. You need to have enough pregnancy hormones and I believe at 6 weeks there would be enough to tell.