Mine was exactly the same, so when it came to BT time 11dp3dt, my blood test showed a HCG of 14, which I believed (and still believe) was the pregnyl. My FS reckons it's not, but I firmly believe it was.
On 9dp3dt, the day after final pregnyl 1500 booster, I went and did a blood test that shower p4 was 437 and HCG was 39. 11dp3dt (2 days after pregnyl) the BT showed p4 at 88 and HCG at 14. The FS is trying to tell me it's a chemical and I'm telling her it's the pregnyl. You see, the pregnyl product sheet says the half life of pregnyl is 33 hours, so they claim it's definitely out of your system after 3 days, but I disagree.
They refuse to give me p4 support in lieu of the pregnyl to confirm that the next one is indeed a chemical.
They tell me that even tho the HCG is >5, the progesterone is high which indicates a chemical. But it's just the progesterone lowering as a result of the HCG leaving my system..
The answer to your question is dependent on when your official BT is. If it's 11dp3dt, you will see a HCG reading >5. If it's 12dp3dt, it will be between 5-15 and if it's 13dp3dt, it's unlikely your HCG will be >5. If you have an FS like me, she'll tell you the pregnyl is out of your system after 2 days, but it's not because I checked the poas and it took at least 5 days for pregnyl to leave my system.
Can you please let me know when your official BT is so I can check with you then? I'd like to know if I'm correct. My FS refuses to use other p4 support on me and I'm going crazy on pregnyl!!!!