Dong Quai. Any herbalists out there??

So since I’ve stopped birth control, I’ve had spotty/light periods. Haven’t gotten back to my normal flow. I’ve been reading up on Dong Quai and how it can help. Does anyone have any experiences with it? I’m also trying to figure out when I should take it? I know I stop when I’m ovulating, just not sure if I should start day 1 of my period or after my period finishes. I just came off my spotty “period” and I’d like to start it! Any advice would be greatly appreciated!!