Help with the acronyms!

Bernice • 29 YO mommy to 1 adorable 6yo boy. Doing it solo but enjoying the ride
So I'm pretty new to Glow and I always enjoy reading the threads you ladies post but sometimes I'm so lost with these acronyms! Like BFP or OPK- if you ladies could give me some of the most commonly used here on Glow I'd really appreciate it!