I got a faint pink 2nd line on my HPT 9 days after embryo transfer. Does that mean I'm pregnant or is the HCG still in my system causing a false positive?

If it is more than 10 days after your HCG trigger shot, and you haven't had any HCG booster shots since then, it should mean a BFP. It would help if you had tested earlier and got BFN's, to confirm the HCG had cleared your system, at least at levels detectable by HCG. I was already testing negative by the time of my frozen blastocyst transfer, but everyone is different.