I'm new to all of this 🙈

Jessica • We will get there ❤
Hi ladies ! 
My fiancé and I have been trying to conceive for two months now, I think this app is amazing ! Everyone seems so supportive, I was just wondering if people could tell me the meanings of the abbreviation's also my period is due on Friday, I have clearblue early detection tests and also wondered when is best to take the test? It's all so confusing! 
Also iv been having strange stomach craps and can't stop eating everything (mostly chips and cheese) is that just me imagining things? 
Thank you so much in advance!