So my gf is the one who tried to conceive. She always gets her period before me. Glow is telling me I will get my period the 23 this month and my gf still hasn't gotten hers. We've tested a few times but we keep getting negatives.. should I just keep waiting to see if she eventually gets her period? Or is it possible she may be pregnant but it's not showing up on a pregnancy test. She tried to conceive on December 7th.