Freaking myself out?

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I'm 18 and me and my boyfriend have been waiting a year and a half to have sex. We finally did and I lost my verginity. It was great but the only problem is I'm freaking myself out. We used a condom two days in a row. The second night I decided it would be a good idea to use plan b until I get birth control. So we bought a plan b and haven't had sex since. Today I'm supposed to get my period and I'm freaking myself out. Am I being too nervous?