Hi. I've Had Normal Period Before. When I Started Working

Hi.

I've had normal period before. When I started working earlier this year, i've been under a lot of stress & working under pressure has seemed to mess my periods somehow. Had my periods on and off since January (exp; a month without period, 2 months with, a month without and another one month with)

Went to the doc and he gave me norethisterone to induce my periods. Did ultrasound scan & urine test, not pregnant, I'm not even sexually active. Had my periods 3 days after stopping the pills but not having period for the next month after calculating my cycle. 4 days late and I went straight back to the doc. He said I might be having something called anovulation, I don't know. He later prescribed me with more of those norethisterone to be taken for 2 months duration in hope that my periods will re-establish itself later.

What I need is a normal cycle as I'm getting married in 4 months & want to TTC right away. Do you have any other advice? I'm worried. :(