Our expert says:
There is no way that pregnancy is possible if the ejaculate (come) has no contact with the vaginal opening - i.e. semen cannot be absorbed through the mouth if that's what you are thinking. The fact that you had unprotected sex in December though, may have resulted in pregnancy, despite you having had a period. It is unlikely, but not impossible. Given the lateness of your period, it may be in your interests to take a pregnancy test.
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