I was looking for an answer to the Pregnyl question and found this on another question site:

Q: Can I use an HPT if I had an hCG injection (such as
Profasi, Pregnyl or Novarel)?

A: You can, but you should wait 7-14 days after your
last injection before the shot is out of your system.
If you test too soon, you might get a false positive.
Wait 14 days after a 10,000 IU injection, 10 days
after a 5,000 IU injection, or 7 days after a 2,500 IU
injection.

I went through the false positive cycle previously and it was pretty devastating.
Then I was using pregnyl every 3 days, but this time I haven't had one for over a week.

Ant, I get similar symptoms to you. I am sooooo tired, really sore (.)(.)'s and all of a sudden hunger. Must just be from the extra hormones flowing through our bodies. Unfortunately it can be from a real pregnancy (I was 2ce before but m/c'd) or from what the clinics give us to take. Frustrating to not be able to count on any particular signs!

Still have the dilemma - should I go try a HPT?!?
What about a 1500 shot? I can't seem to find an answer for that one