According to glow I was supposed to start on the 7th, I didn't so I chose "my period is late" and it re set me to start on the 10th, and I still didn't so I chose it again and it has me set to start tomorrow, but I'm really worried because I had sex a week or two ago (around new years) which was just after my "fertile" period, no birth control other than withdrawal.. and like I said I was originally supposed to start on the 7th. Glow is almost always correct for me.. I've had some period like cramps the past few days as well. Opinions on if I could be pregnant?