Reclipsen side effects ?

So I have had many issues for the last few months with my period but now I am concerned with many things. Since July I have had major changes in my period. I went from having a very regular five week cycle to having none to 8 week gaps between. In September I started Loestrin24. I did not get my period for two months. I am now currently on Reclipsen. I am on the third week of pills. I had unprotected sex after two weeks of Reclipsen and I don't know if this was a good idea since I changed pills. He did not ejaculate in me but precum is a possibility. Do I have anything to worry about?

Also I am having other symptoms that I don't know if the birth control is causing them. Since starting Loestrin I had major acne issues that have gone down since I started Reclipsen. Also I have had bad chest & abdominal pain while on both Loestrin & Reclipsen. Lastly now I feel much more bloated & tired all the time since I started the Reclipsen. Could the birth control be causing any of these issues? Most importantly the chest/abdominal pain?

And lastly, I have recently lost 10 pounds and been bouncing around in weight. I am currently "underweight" (107 lbs & 5'7") by some bmi charts and also I am a dancer so I have a lot of muscle compared to fat. I figured my issues in having no period might be due to the weight. Is there any health issues with not having a period for this long?