Anyone with me?

Cycle day 16 I got my LH surge according to my opk. Its cycle day 20 today and I have been having really bad cramping since last night(I went to a later movie with hubby so not sure when it started as I was distracted by the movie) and that's when it started. It was just a little pain but this morning it woke me up and hurts like AF will be here. This is our first cycle trying so I am in disbelief that I could be pregnant and am trying to keep it that way so I don't get my hopes up then crushed when I do take a test and it's negative..Anyone with me here?