Irregular Periods

So I got off birth control in June and had my period June 20th to the 24th and then another period in July on the 27th to the 31st then I didn't have a period for 3 months and I went to the doctor so they put me on some estrogen pills to start up my period, I started a week after I finished the pills and had my next period November 2nd to the 7th then I bled again that same month the 18th to the 20th and haven't had a period this month yet. I have had cramping for about two and a half weeks now and they kind of come and go. I had regular periods before I got on the pill, so I would assume I'd get regular periods now. I have nobody to talk to about it because most my friends don't know much about that stuff. It makes it hard to try for a baby when I don't even have a regular period. I've been to the doctor and they say it takes an average of 6 months to have your body regulate, last month I even took ovulation tests and two days after my period I tested high for 6 days and I ran out of test strips so I don't know if I even ovulated which I don't think I did. Any input would be nice, thank you.