Hello... I too am a spotter : ( also TTC.
I'm 37, never been pregnant. Was on the pill since my early twenties and developed brown spotting for 2-3 days for the last 5 years or so whilst taking the pill, the spotting always occurred at the same time each month. GP told me not to worry about it and that it's normal.
However I have now been off the pill for 7 months, TTC. The spotting has continued and is now more prolonged. I spot for around a week before my period, light brown spotting, occasionally bright red.
I have had a pelvic ultrasound which was normal, hormone profile was normal and showed I was ovulating. I use home ovulation kits and get a LH surge at the same time each month; day 12 of my cycle.
My periods are regular every 28-29 days, although they are light and shorter than they used to be, even when I was on the pill.
I have been to see a Gynaecologist, who has tried to do a pipelle biopsy but wasn't able to get through my cervix (which can be normal so I'm told) . I have had my thyroid function tested which is slightly elevated with my TSH at 4.8 and have been started on a low dose of thyroxine to see if this helps, although your TSH level should be around 2.0 when TTC anyway.
I have only been taking the thyroxine for 2 weeks but I have started my spotting on cue today - day 22 of my cycle! It's always the same time each month, I can set my clock by it!
My GP isn't concerned, my Gynaecologist is more worried about it, and thinks if I haven't conceived within the next 6 months then I'd need to look into fertility treatment as its also likely that I would have poor ovarian reserve at my age!
Would love to hear of anyone going through similar experiences and if you were able to resolve it and get pregnant.
Many Thanks : )