Had my iud removed in beginning of December found out I was pregnant beginning of January had miscarriage early February. Have been trying to follow my <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation calendar</a> to become pregnant. But I think this app. The nurse practitioner where I worked started day 1-16 if when you need to have sex. Day one is the first day you get your period. And it worked for me.