My girlfriend took take action pill and her period lasted only two days?

The pill contains a Progestin, the drop in Progesterone is responsible for the bleeding at the beginning of a new cycle. To me it seems normal enough that a high dose could stop it again.

It is always good to know that you can get pregnant on your period. For one you can actually experience other bleeding and not your period (what happens after ovulation) and you can bleed for quite some days. Realistically though you can count yourself as fairly safe until Day 5. With only potential pre cum on her first day there is nothing to worry about.

It sounds like some research in this area would help. Also considering other forms of birth control on top of condoms.

/r/TwoXChromosomes Thread