There is no way to know 100 percent, you will have to do a DNA test to be sure.
Plan B , is not 100 percent effective even when taken within a hour or two.
And it is possible to have first period and be pregnant ( not as common but possible)
He does not have to finish in you, all he had to do was be in, there is plenty of sperm in the early fluids,
So while not as big of chance, First guy is slightly possible, but possible.
Person two, you really waited too long for Plan B, it gets less and less effective the longer you go, and has almost no effect after 72 hours. So if you waited 3 days, that is 72 hours.
So guy 2 has more chance, and it can be him,
But because it is possible, although just slightly, Guy 1 can not be ruled out completely.
So after baby is born, just get a DNA test done to be sure.
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