When switching sources, how long until the bloodwork stabilizes?

I'm currently on 200mg test and 150mg primo, I had to switch brands and source. Also swapping out primo for masteron because I couldnt find any primo.
I want to blast soon but first I should switch to the new products while keeping the same dosage and then do some bloodwork to make sure they're not bunk.

So my question is once I switch to the new products, how long until I can get my bloodwork done and then start my blast? 3-4 weeks enough?