My DH and I have been TTC for 7 months, after removing the IUD birth control. For 6 months, I would start spotting anywhere from 3dpo to 8dpo and I would continue to spot until AF came on time. I got my progesterone levels checked and the doctor said they were normal, although I didn't agree. I even took prenatals for the entire 7 months and used preseed. Finally it happened, and I believe it was due to the fact that I started taking methylated b6 vitamin supplement. I have done research that indicates a gene mutation can cause an inability to properly convert b6 and b9 (folic acid) into the forms your body can use. This is likely why the normal prenatals I was using did not work. Anyway, I will also be taking methylated b12 and methylated folate instead of regular folic acid to ensure that me and baby get the usable forms of these vitamins. In the mean time I am also getting my genome sequenced to see if I have the mutation. We only BD once this cycle, which speaks for the effect of the b6 since I got pregnant the same cycle I started taking it.
As for the symptoms, I had almost none but I will go through anyway because I know how it is to symptom spot
1-5dpo - no symptoms
6/7dpo - nausea, I also normally have insomnia but these nights I passed out before midnight and I could not keep my eyes open
8dpo - no symptoms, I just thought it was odd that I wasn't spotting like I normally do by now and I had no breast pain, took a test and got an extremely faint BFP
9dpo - tested w/FMU and got a faint BFP, but it is darker, only noticeable symptom is that I did not want an egg with my bagel, will be purchasing FRER today just because I am still in disbelief
If you are spotting every month before you period while TTC, I strongly suggest trying a methylated b6 (not Pyridoxine HCl). If you get pregnant after doing this, consider taking methylated prenatals as well since this gene mutation is fairly common.