When did you take a HPT after transfer???

Jen
I had egg retrieval today! We got 5 eggs. I was hoping for more but that's still good. Transfer will most likely be Tuesday the 19th. I have beta HCG blood test scheduled for the 29th. Has anyone take a HPT before that? Would it be a false positive due to the HCG and Lupron trigger shots on 4/12 & 4/13?