How Accurate Is Glow For Ovulation ? I Just Started Birth Control On Feb. 7th . It’s Basically The “Mini Pill” My Boyfriend And I Had Sex The Same Day And He Came Inside Me Because I Started Birth Control. I Researched It After And Found Out It Isn’t Effective Until 48 Hrs Later. I Took A Plan B On The Feb 10th. Just Incase, Glow Is Telling Me That I Ovulated Yesterday, But Other Ovulation Calculators Are Telling Me Between Feb. 5-8th. I’m Experiencing Mild Lower Abdominal Cramping And Now Lower Back Pain. Could I Be Pregnant?