How long can a transfer blastocyst day 5 survive in the uterus? what if it partially implants but progesterone level drops and then rises the next day

Progesterone: Progesterone levels fluctuate from day to day and hour to hour until pregnancy is well established - weeks from now. Do not panic about an individual level, what matters to the baby is more-or-less an "average" Progesterone exposure. If you are worried about your progesterone, please discuss these worries with your ivf doctor, he/she is the only one who can make changes if they are needed.