Cycle day 42

Katie

So I am currently having a really long cycle and on day 42. My last period started 1st November for 4 days so I am basically 15 days late. I have done soooo many tests and all BFN. I haven't tested now for a couple days as I have just gave up. My breasts have been so sore for about a week and I am getting really weird cramping similar to AF but different. I don't know what to think if I am honest. I don't want to call my doctor as I feel I will be wasting his time as I am getting negative home tests. What would you do in my situation? I am nearly 32 and TTC baby number 3.