Sex at any time, including during her period, can result in a woman getting pregnant. It is, however, very unlikely that she's pregnant, mostl likely less than that 2% to which you refer.
If you're not in a monogamous relationship, you must use a condom every time, without exception. That line about you sleeping with every person she's ever slept with is a cliche by now, but it's still a good, healthy way of thinking about stds. Protect yourself, and protect her.
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