Probably a stupid question

When do you start to count your pre-pregnancy weight? (That question doesn’t even make sense)

I had been in the process of losing weight via weight loss medication, supplements and a diet plan.

I’m not sure if my pre-pregnancy weight starts on the first day of my last period or on the day I got a positive test??

I’ve gained about 4 lbs since stopping the weight loss medication and supplements (vitamins + diuretic) but I’m still down 3 lbs from the first day of my LMP.

Lol I’m sure I’m just overthinking this.