Cycle disturbance .. Desperately need Help!

Mila
Before Dec 2015, i had perfect cycles - 28 days and my period lasts 4-5 days. Then in Dec 2015, my cycle got delayed by 10 days and my period didn't stop even after 9 days with heavy bleeding. My then Gyneac gave a medicine to stop the bleeding and gave a medicine to ensure I get my next period on time. And then in Feb too I had delayed period, and the doc wanted to do a procedure to understand why the delay happened. Not convinced with her reasoning, I went in for a second opinion and the new doc (who is much more senior) said I probably had a miscarriage in Dec, based on the symptoms. In Feb, I had a chemical pregnancy. She asked me to give a break for 2-3 months before trying again - so the body can recover. 
In May and June, my cycle suddenly changed to 30 days and I notice a brownish discharge for 2 days before my period starts. Now it's July, I'm on my day 31 - no period but I have the brown discharge (not heavy, but present). 
I will be seeing my Gyneac but Can someone tell me
1. Is it ok for the cycle to suddenly change 
2. The brown discharge and delay in cycle (again), what does it indicate? 
I'm freaking out and would really appreciate help and share your experience.