OPK and CM conflicting dates?!?

[birdyb]

My cycles are 32-34 days long, ovulate on CD18-20 and have a 14 day LP. I am really confused about when I actually ovulated this cycle.
Here is what happened:

• CD18 watery CM, -OPK AM & PM, temp 97.1
• CD19 watery CM, -OPK AM & PM, temp 97.1
• CD20 A LOT of egg white CM, -OPK AM & early PM, temp 97.1
• CD21 dry CM, +OPK in AM then -OPK in PM, temp jumped to 98.1
• CD31 weird pain that lasted only a few seconds then very light spotting, temp jumped from 98.1 to 98.6 (implantation??)
• CD34 AF due today, not here yet and no PMS but -HPT FRER, temp still at 98.6

I am confused because the day I had the most CM I got a -OPK. Also I read you are supposed to ovulate 24 hours AFTER you get a + OPK, but my CM was dry at that point.Also, has anyone gotten a -HPT on the day of their missed period but still been pregnant? The FRER I took said it works 6 days prior to your missed period, so I am losing hope