Am I giving my hopes up??

Kristin
Hello! 
I have been TTC for a few months now. Had a miscarriage in January. Ever since, my cycles have been 30 days instead of the normal 26 days. Idk if the miscarriage completely changed my cycle length. But I for sure thought I was prego this month. I have been crazy tired the last few days, I had mild cramping about 7-8DPO, and had weird appetite. I tested today and got BFN :( I am having mild cramps now I feel like AF is coming soon but I really thought this was it! Any suggestions or advice would be awesome!