Irregular periods. How to get periods?

Hi My last period was on May and no periods after that. I am not pregnant. I am having some chronic pain in the jaw and taking several medicines for that in the last 2+ years. No relief with that pain yet. Periods were regular until May. I saw the GP and she did thyroid, prolactin blood work and it was normal. So she put me on birth control pills for a month. I started that pills 3 weeks ago and I noticed some spotting after started this pill. It's not like severe spotting. I just see the spotting after I urinate. It's not heavy spotting. Is spotting expected when taking birth control pills? Do we get periods when we take birth control pills? Will that induce periods? I didn't take any ultrasound now. How to get periods after so many months? I feel like my stomach is always bloated and feels big. I gained weight recently and tummy feels big and bloated. I tried natural remedies to get periods and it didn't help. How to get periods?