TMI - Passed large clot on first day of period

I passed this large clot today. When it came it, I felt it but thought it was just blood like always until I finished walking the dog and went to the bathroom and found this in the pad. It was kind of sac-like until I opened it flat. I’m not worried about a miscarriage (I just had sex for the first time in 9 months 3 weeks ago, condom + I’m on BC) but I am just worried about passing such a large clot? I did have very bad cramps this morning.

The second pic is what the inside looked like when I opened it and the first is the outside.

I AM on the Nuvaring and skipped my period (purposely) last month.