TTC first month here! DTD at CD20 (I have a 36-37 day cycle usually). Felt my period cramps coming. On CD 37 I had some brown spotting. Figured AF would start the next day. Nope. Brown spotting CD 38. It is now CD39 and cramping is mostly gone with more brown spotting.
Took a HPT on CD 36 and was negative.
I am on LE diet and slightly underweight.
Anyone have experience with this? When is CD1 for me? So confused.

