Menstrual cycle

purpleRain

So my mom told me theres like only a week where u cannot get preggo so i want someone to help me here with some questions!

1.if i have sex like maybe tomorrow can i get preggo yes or no And why?

2.And does glow really knows ur ovulation date or is it a guess

3. The green once means 1 of thoseee days i maybe fertile or is them all