Pregnant while on period?

My fiance and I have been trying to have a baby for the past six months with no luck. We had sex on the first two days of her period. The strange thing is her period only lasted three days. She said in her whole life it has always lasted 7 days. Never more, never less(she is 27). She thinks she may be pregnant. I've heard of people getting pregnant on their period but as I've understood it usually this is because the sperm stayed in there alive and got them pregnant after the period is over. Is it possible to actually get pregnant during hte period and have your period end prematurley? I've heard that periods can last from 3-7 days but hers has always been 7 so it makes me wonder.

Answer:
I think it is very rare, but if it is supersperm (meaning that it lives for many extended days) then it is possible. Rare but possible.
Rare, but it can happen.
just take a pregnancy test

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