Babydust: while implantation bleeding can last several days, the bleeding usually is not heavy enough to (for example) use tampons. How heavy was it?
Amber: yes it sure is interesting! I work in a different medical field of research but do have access to all scientific literature, including ones about reproductive endocrinology etc. Some of the papers are open-access and can be read by anyone (like this one [click] that investigated the predictive value of the LH rise vs LH surge, several other hormones, CM and BBT on ovulation). If you ever find a paper you're interested in but can't get access the full study, send me a PM and I'll get you the PDF.
Some other things I've learned:
- LH surge values ranges from a 2.5 fold increase all the way up to a 15-fold rise
- About 43% of women have a sudden increase (spike) while 57% have a gradual increase that lasts 2-6 days (so jmack, your positive-ish OPK's seem very normal and there are plenty of records showing high LH a day after ovulation, in fact, one study shows that the LH surge lasted >3 days after confirmed ovulation in 60% of cycles!)
- BBT is not as reliable to confirm the day of ovulation as we think and does a horrible job trying to predict ovulation (lowest BBT does not predict ovulation well)
- Keeping track of your CM is, however, a great way to determine your fertile window.