Abbreviations???

Hi girls, I'm 23 years old and I've been married for almost 2 years and I'm new here :). I've been trying for 3 months to get pregnant and I loved the idea of this app I read some of your posts and I don't know what the abbreviations stand for?? If someone can help me please :). Thank you and wish me luck. Hopefully this month is the month that I conceived . Blessings from me :)