Hi Lucy. Sorry to hear about your miscarriage. I hope you are doing ok - it's a hard time to be going through.
After my miscarriage last year I went back on the pill for a month, which seemed to get my cycles back to normal again. I went on the pill as at the time I fully believed that I never wanted to be pregnant again! Once I got my AF a month later, I had healed a bit and realised I was being irrational.
It is very normal to have irregular bleeding, but hopefully this month is a sign that things are returning to normal for you.
Have you thought about temping? It's a great way to really visualise and get to know your cycle and may be able to answer some questions. I have found it really helpful.
Good luck with TTC again. Hugs!