My last period's first day was June 27. My boyfriend and I had unprotected sex twice since then, but he never ejaculated either time. My average span between periods is about 30-31 days. I also received two immunizations, one for Tetanus and Meningitis, two days ago. Could they interfere with my period? Should I be worried? I'm only 18, and my parents would kill me if they knew.
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