Hello
Thanks for your query at DoctorSpring.com.
Following a miscarriage, it is normal to have some amount of erratic spotting and menstrual bleeding for 2 - 3 cycles, so do not worry.
It is normal.
What is strange is the exact timing that you have observed.
I would have advised a scan to check that the uterus is completely empty, but that is already done.
Endometriosis might be actually acting up after the past miscarriage and causing this kind of spotting, and if so, that might hamper your fertility.
maca root might also be causing the changes.
Since you are going to be 40 next year, it is paramount to have your fertility looked into.
Please have an internal exam, Pap smear and a pelvic ultrasound scan done transvaginally, plus hormonal levels ( FSH, LH, TSH, Prolactin ).
That should reveal endometriosis, polyp, a cervical lesion or any such reason for the spotting.
If all this is normal, you can put it down to post miscarriage issues, which should be sorted out in a month or two.
All the best.
Looking forward to hearing from you.
Take care.