Steaming itself increases circulation and therefore uterine function which should be helpful to clear out the clots and brown discharge you described.
Regarding herb selection, this is determined based on the Period Profile which takes into consideration menstrual cycle length and sensitivities such as uterine bleeding or excess heat.
There are a couple ways to figure out which herbs would be most suitable for you: 1) Do an intake form with a certified Peristeam Facilitator, 2) complete the Peristeam Faciltiator Certification which will instruct you how to screen yourself, determine the best formula and make herbal formulas. Once you have the right herbs, they will naturally help to balance out your menstrual cycle which is helpful for fertility purposes.
For fertility prep, it is also recommended to do a consultation with a Peristeam Hydrotherapist in order to determine if you have any menstrual cycle imbalances other than the stagnation you described and to create a conception steam plan and schedule.