I’m so upset

I hate getting my hopes up but I really want a second baby and everytime I get a BFN my heart gets crushed. I ovulated around the 15th and have been consistently cramping since then, I’m EXHUASTED all the time, and my boobs feel like sacks of rocks they are so heavy.. AF is due in 4 days.. I normally cramp and get tender boobs the day before or day of AF. But I’ve never experienced cramps everyday the two weeks before AF. I tested again today and yet again... another BFN. 😭