Hi KikiJane, I would not test until at least a week after your last HCG shot...
it can stay in your system for up to 10 days, but in most people its gone by day 7!
I tested 10 days past my trigger shot, which was 4dp4dt, and got a BFP!
Good luck to you and I wish you alot of patience!
2003,
2005 and 9/2009 IVF/PGD BFP! Hoping for a 
BFP @4dp4dt (very faint)
beta#1 @ 7dp4dt- 30........beta#2 @ 9dp4dt- 124........beta#3 @ 11dp4dt- 305........beta#4 @ 14dp4dt- 1290.........beta#5 @ 17dp4dt- 2792 .....beta#6 @ 21dp4dt- 13900