My progesterone had dropped

I had my 5 day blastocyst transfer on Jan 13.
Jan 21 (4w1d) E2 -11568; Hcg- 99.25;    P4-52.58
Jan 23 (4w3d)                    Hcg- 332.13;  P4- 57.94
Jan 27 (5w0d)                    Hcg- 2761.09; P4-38.8

My progesterone had dropped. Pessimism started to bug me. Few days ago, my friend had failed ivf. Our cycle was only 5 days apart. She had uterine biophysical score of 19/20. I could not believe she had an implantation failure. She had LIT and 3x ivig. I began to suspect that there was lapse on part of our immunologist. Oh no! Or perhaps, something went wrong with her th1:th2 again. Our case is very similar. But, we don't share the same ivf doctor. Or is it the lapse of her ivf doctor.

Could I be having a blighted ovum? But, we transferred two embryo. I pray for at least one implanted embryo. Let it be. I don't know if I deserve god's grace. I will cry if there is no gestational sac on saturday. (5w5d). Scary! I still have the Jayden's Coke Deprivation Syndrome within me. ^.^ I have never outgrown my emotions. What should I do next, if I have failed pregnancy?

I feel slight throbbing sometimes in my pelvic area. I hope the throbbing is not in the fallopian tube.

What is anti-progesterone antibody? Grrr... I miss my beloved immunologist.