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Could be stress, could be changing hormones, could be you were sick and it threw your period off. I would say that if you got your period, even late adn it was only a little shorter than normal then you are probably not pregnant. Wait until your next period should be and take a test if you don't get it.
Uh this is kinda what happened to me. I didn't have my period one month, but the next month I had an abnormally late and long period.I was showing negative for the past months. I went to the doctor and she said I was 5 weeks pregnant. There is a chance. I would take a test, but if you are really concerned you could go to the doctor as well.