I do, only since the birth of DD#2. From 3-7 days before AF, and also after.
My doctor wasn't too worried about it, hopefully if your LF is long enough it doesn't signal low prog.
Check out the HUGE thread, a lot of ladies have gone on to get preg.
https://babyandbump.momtastic.com/t...g-week-before-af-every-month-anyone-else.html