Always had a regular but slightly short cycle (27 days). Since TTC I have months where it's 25 up to one month at 30. The rest are my usual 27 days.
I have really light flow (mooncup day 1-2, can get away with liners from day 2 and only need 2 a day and then light spotting until day 4 & that's it). Today AF turned up again and I noticed the flow was bright red this morning when I came on, but within 12 hours it's dark red and almost brownish. (Joys of mooncups eh, suddenly have you noticing all sorts - sorry)
Do you think there's a link between really light flow and not having enough lining for implantation? It's a long shot but thought I would ask.