I usually get a high/euphoria a few days later. I've had so many implants at this point I'm over the excitement of actually getting it, but I do notice how happy I feel later on. I guess in your case the two causes will merge together and you won't be able to separate them out, this time anyway. Next time you might.
I've also found that I feel really down and lethargic towards the end of the implant. Even at 1000 pmol/L I feel like crap.