>Any suggestions or similar experiences
Definitely similar experience!
I have a girl that I really wanted a show pup from. Her seasons were extremely intermittent, and very short when they did happen. Hardly any loss whatsoever, and no sooner had she swollen, than she was back to looking like a maiden in rapid time.
Reaching the age that I knew it would be my last time for trying, I mentioned to my vet that she hardly swelled, and didn't last long. Instead of advising me to try testing from day 10, he said let me know IMMEDIATELY that you see any swelling. Found her really swollen one night, and took her in the following day. Tested daily until she
ovualted on day 4. I would never have thought of progestorone testing that early!!