I don’t understand - Help please

I have 3 kids I’ve birthed- I’ve been pregnant a total of 7 times.

For 20 years of having a period, I bleed for 5 days without fail.

I am being a surrogate and we inseminated last month.

I got a 3 day, barely bleeding period, 3 days late this week...

Today I took this..

I know there isn’t a chance, but I’m just confused on what my body is doing. It’s SO weird.

Anyone had anything similar before??

Edited to add : this morning 2 days post bleeding stopping I had brown tinged ewcm when I wiped??