She is due to rear her ugly head on 3/13/16, most firtle point is supposed to be on the 27 with 33% chance of conception, according to glow, are there any opk's anyone would suggest? Preferably one that's not super complicated, I've never used one before so kind of new to the whole <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> thing!