Might be possible but unlikely. You could have sex every second day just incase but your ovulation strips won’t be reliable until hcg returns to 0 then LH will probably drop and then eventually you’ll get peak again mine was significantly delayed after my miscarriage so don’t think you missed it if you haven’t peaked again on schedule
The faint HCG indicates that the count could be close to 25, which is gonna be picked up easily by LH strip, which explains the dark line. My HCG didn't drop to 0 before I ovulated, but it was around 10, and hence was getting negative on HCG strips and moderate positive on LH. I stated getting lighter LH results and hence was able to track ovulation.
I peaked when I had a very faint postives hcg test and my BBT showed i did ovulate so it's possible