Cycle confusion

Cassandra • -Son born 5/9/13 -Daughter born 8/16/15 -currently pregnant w/baby #3 (girl)
Last 2 cycles were 31-33days and I know that I Ovulated last month cd18  (I has natural early mc in July) this is my 3rd cycle since then and I'm very confused...
I've been taking opks/check cervix & cm as well as bbt. Pretty sure I got a pos opk cd10 at 10am (see pic) cervix was soft high open and wet (show)  I tested again 4hrs later and negative opk
Currently cd13 opks still neg cervix is soft high closed and wet (light cramping last night and this morning)
We baby danced 
Cd9 Cd10 Cd12
My bbt chart does not correspond with possible ovulation 
I need your thoughts what's going on??!?!

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