It doesn't sound like you're pregnant. You just got your period. The first sign of pregnancy is a missed period. Any vomiting before a period is likely something else.
Like Chuck said, if you feel that this may not be a normal period, then try a pregnancy test in 2 weeks. But from what you said, it sounds like you're just psyching yourself out.
If you don't wish to become pregnant, the only way to avoid that 100%, is to not have sex. There is no form of birth control on the market that is 100%, even if you use 2 or more you can still become pregnant.
Good luck.
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