Extremely long cycle

I'm am currently on CD 51 and as of last Wednesday still getting BFN on HPT.  Just wondering if it's possible to be preg. and still get BFN?  I have the same symptoms as when I was preg. b-4.  I MCed in Oct. and since then my cycles have been 32, 28, 34, 39 and now I don't think it's ever going to end.  I have a Dr . appt. next Monday but just wondering what else could be causing this if not preg.  I also had a neg. Beta a week and a half ago.  But with last preg..I was almost 8 weeks b-4 I got a BFP.

[USF-M.D.-JM]

Home pregnancy test are pretty good. In a 28 day cycle, and one misses their period, their bhcg is about 100, and most home pregnancy test pickup down to about 25. You could do a blood bhcg, very little false positive and false negatives. If you are over 35 I would get a CD 3 FSH or do a clomiphene citrate challenge test to evaluate Ovarian reserve/reproductive age. If under 35, test for proof of ovulation. Hope this helps.
JM

[Brown Eyed Gurl]

Thanks I have an appt. next monday and maybe I can figure what's going on. I'm 21 so I'll have them check for Ovulation.