Need some help ladies

So... my husband and I just started trying to conceive baby #3 Nov 27th, we BD everyday until Dec 16th. I have tested all week and got 2 vvvfl on first response two days in a row and then this morning got BFN on a first response, a clear blue digital and a accumed test strip. I have had this achey cramping and when I bend over to say tie my shoe or hunch over ever so slightly for a few minutes starts to get pretty uncomfortable, really just more achey and when I lay on my back the same thing. I know I really actually have until the 30th to be out for the month but have any of you ladies had the same type of symptoms and gotten a BFP?