Talk about stumped...

Crystal • Child loss survivors currently trying Rx w/intercourse following removal of uterine septum, Endo, and fibroids.
I had a miscarriage early/mid May. I got my first period June 9th. I've had three other MC's prior to this last one. Every time my second cycle was when things went back to "normal". I was supposed to start my second period yesterday (7/7) and nothing is happening. I had some light cramping yesterday morning and wore a pad to work just in case - not even any spotting. No cramps. No fatigue, in fact I've been more energetic than usual. Here's the thing, we haven't had sex but once since the MC, and that was with protection and two days BEFORE I had a saline ultrasound. There's no way I am pregnant. 
May last two MC's were 3 years apart. During that three years, I would start spotting a day or two before my cycle started. The cramps wouldn't usually start until the day before or Day 1. They would get increasingly worse over Days 1-2 until I was MISERABLE. The pain was almost as bad as a miscarriage every month. My periods lasted almost a full week (sometimes longer) every time, including a couple of days of spotting before and after the heavy flow. I would pass huge clots the size of grapes, sometimes ping pong balls. Sometimes I would have to miss work, but I usually tried to fight through it. We thought it was PCOS, and I do get cysts regularly and they did diagnose me with that at first but are saying now that all my cysts are gone and maybe I'm just prone to "normal" cysts. (Not sure what the difference is.) 
Let me just say, I finally got decent insurance and we are seeing a reproductive endocrinologist. I'm undergoing a lot of testing and treatments so that we can figure out why we can't get a baby to stick. And this is not my first rodeo, so I know it takes our bodies some time to adjust after a MC. It's just that every other time my periods went right back to normal by my second period and this time I'm worried something might be wrong. Any helpful ideas or encouragement?