Hey there, if you have had your periods and you took the morning after pill within the 72 hours which you did, then no, I don't think you have to worry about being pregnant. If you are still worried the only way to know for sure is to get a pregnancy test done or get a home pregnancy test, but given the information you have given I think it is very unlikely that you are pregnant, good luck :)
If you have started your period, I don't think you will need to have the test, some women do have bleeding like a period every month during pregnancy but this is not very common.
If you are still worried though the test give the best result when taken around a week or so after your period is due to arrive, then there should be no question about the result. all the best to you sweetie and try not to worry I think you are safe from pregnancy :) xxxx
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