New to Glow

Hello Ladies! My Ob/Gyn suggested I take a look at Glow, as my hubby and I are going to start trying for baby #2. (First kiddo happened 6 weeks after getting married and was unplanned. This time around we are planning and both my body and health have been through the trenches. So not sure if it will happen or not.) But anywhoooo, I have been reading through some of the posts on here and I am confused on some of the terminology. Ttc?opks?bfp? Etc... can someone help me out and enlighten me, please?! Thank you!