Been using glow for months now and it paid off well! My charts for period and ovulation were very accurate with some period day tweaks. I know I'm not very far along so the only people who know are my husband, my 2 year old and yall! Had to get a high hCG test because the $.88 from Walmart aren't the best, I suggest 1st response. Still saying lots of prayers for a healthy baby and no complications =)