longest cycle?

Momma of two, ttc out third the first two were not planned, this over we are trying to do"right" whatever that means, lol. anywho I am on day 37 of my cycle, longest I have ever gone, I should more of a 27-29 day girl. I've taken 4 negative test from day 28 to yesterday, I had one faint positive(day 33) that was the day before my drs appointment, which was a negative there (day 34). I took one negative yesterday as well. my breast feel heavy and I have cramps everyone and again, extreme fatigue and heartburn are a constant these days. I'm very dishearted and slightly confused. anyone ever had am exciveky long cycle, or maybe known if it taken longer up get the bfp?!