So my girlfriend took the Plan B pill 18 hours after having unprotected sex, when she took the pill 3 hours she started feeling some side effects, like headaches cramps and stomach ache, the side effects went away for at least 2 hours and then came back and this kept happening so I'm wondering if this is normal because she barely took it yesterday? Her period is supposed to start around January 24 and we had unprotected sex on January 8 was she ovulating?