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Thanks for this question
This is certainly a complicated situation
I would say the odds are in your favor that your boyfriend is the father. However, the time course of intercourse with the other person is VERY close. Within days. So it is possible that he is the father too.
The only way to know for sure would be a paternity test
There is probably no need for plan B here
Of course it is up to you.
But it does not appear needed.
still need help?