It's really not uncommon to have an anovulatory cycle, but if you're watching every day because you're TTC, it really is torture.
Occasionally, however, it's not an anovulatory cycle. I had 5mc before I fell pregnant with my son during a monitoring cycle where they did bloods and scans throughout the month. It turned out that what had looked like a short luteal phase (I was temp monitoring so had a load of data to show my recurrent MC consultant) was actually a failure of my body to release a perfectly good egg when it was ready. The consultant sonographer saw this apparently lovely egg at CD14 and packed me off to the pharmacy with a prescription for an HCG shot administered on my return, sending me on my way with a cheery "I'm sure you know what your homework is!"
That egg was indeed lovely, because it's now my 12 year old son. When I saw my consultant again with a BFP, she was annoyed that her colleague had intervened instead of monitoring, but was interested in the data point. I've had 2 more MC since, so we stopped at just one, but I've since been diagnosed with coeliac disease, which they apparently now feel may cause recurrent miscarriage. I'm not sure they know the precise mechanism, but since I have a positive party of autoimmune conditions going on in my body, that's presumably at the root of it somewhere.
So. If I had any advice, it's monitor your temperatures because it can help show a pattern to a consultant. Having had 3mc you should qualify for referral to a recurrent MC clinic, so push for that if it hasn't already happened. If you have the temp data and it shows late ovulation or short luteal phase or whatever, see if you can get them to agree to a month of cycle monitoring to see what's going on. It may be as simple as it was in my case, where the egg was just too knackered to sustain pregnancy once released, resulting in early MC. But data is a good thing to have: there is no downside unless you obsess over it, when that's the doctor's job. And it might be just what you need to have your own gorgeous baby to hold 