There's no way crinone will give a false positive. The only way you may get a false positive is testing too close to your trigger, or if you are having HCG booster shots. Crinone and pessaries just introduce progesterone into the body, not HCG.

First transfer - tested. Got an EXTREMELY faint positive... Was a positive result, but missed miscarriage just before 9 weeks.

Next two transfers - no testing. Also very early miscarriages.

Final transfer - tested, got a positive. But it was the night before my blood test and FIL had invited himself to stay the next night (threatened to sleep in the car when we said it wasn't convenient, so no choice) and I wanted to be prepared.

BW