Irregular periods and m not convincing.

In three years of marriage i didn't get pregnant my periods are getting irregular from last one year sometime it came with heavy flow causing bleeding for several days and then i need to consume crina ncr to stop the bleeding and sometimes i miss my periods then doctor suggest me to take meprate and this procedure is continuously going on since last year And this month i again missed my periods but i dont wanna take medicine now.. So i searched on you tube and came with a result of herbal tea with can be made by boiling in water five ingredients cumin seed fennel kalonji ginger and dal chini m taking this from last three days.. Please tell me what should i do.. I wanna get pregnant but my period are not normal From last year please suggest something to solve my problem