TTC while still breastfeeding

I got my period back about 5m pp while still nursing round the clock. I’ve had cycles 25-29days with two missed missed month back December and March. I am 11m pp now and SHES JUST starting to sleep through the night.

I had my last period just before going on vacation May 12— spent 3weeks in a time zone 9hrs ahead. Never caught my peak but app thought I was nearly there on May 27. I thought I saw a vvvfl but all my tests have been negative since but still no AF.

My questions are:

-is it possible to have a period but not ovulate because I’m still breastfeeding?

-can my circadian rhythm still be so off and make me this late?

-if all my tests are negative, what can I do to help my period show up— my first pregnancy was a mmc and 5weeks passed and I never bled so I had to have a D&C. Is the any chance I could’ve been pregnant but still not have miscarried yet? Would you try to get bloodwork or am I over thinking this?