It could be possible.. 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. I knew I was pregnant despite all my negative pregnancy tests then at 6 weeks the test came back positive =)
I wish you luck doll!
I forgot to mention that around that 6 week mark, if you're going to do an at home pregnancy test, do it in the morning. Urine is more concentrated in the morning (your first pee)