not a real father

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hey mylot can you answer this for me i have a friend and he had unprotected s-- with his girlfriend,now she told him she's pregnant and he's freaked out of his mind but i suspect she isn't being truthful because her menstrual cycle was on time she told me herself what should i do tell him or let her tell him?i mean is it possible for a woman to have her monthly and still be pregnant the last i checked it was a no