Cramps, Back Pains, On and Off Bleeding, Vomiting. Possible

so me and my gf had sex, but i she was on the last stretch of her birth control pack. anyways ever since her pack ended [about 3-4 days after the day we had sex] she hasn't continued to take any more birth control. Recently she's been geting on and off bleeding, back pains, cramps, and nausea. I don't know what's wrong with her. I'm afraid she might be pregnant? is it possible that the last few pills were the placebos to help keep on a schedule? she was on the lowest hormonal birth control, so I'm thinking it's probably not a hormonal flux or anything. I'm scared. Oh and she also had pain urinating for a while. I took a look at it, and it looks like her vagina lips that lead to the inside looked like they were rubbed raw or something.. maybe a connection? She says that it's healing and the pain while urinating is subsiding now and she's on her period again for like the 3rd time on and off, but she says that this time it "feels like a real period". We both tested for STDs results were negative. I dunno, I love her so much and I hate to see her hurting like this. That and I don't think I can deal with a forth period in 1 month. lol.

PLEASE ANY HELP WOULD BE GREATLY APPRECIATED!