Provera, ovulation, BBT shift

I am 26 and have 2 healthy children, both of whom were conceived fairly easily - with only about 2 months of charting. My youngest was born in May of 2006 and I began having regular periods in September (4 months post partum). I had regular cycles of 31-33 days for 4 months and then in January I began having very irregular periods (irregular periods are VERY abnormal for me) that have gotten progressively longer (33 days, 36 days, 44 days, 79 days and I'm currently on CD65). I do believe I ovulated last cycle around CD62, however I wasn't charting so I cannot be certain. Because we are ready to try for #3, this cycle I started charting and went to see my gyn and she did a vaginal ultrasound, checked my TSH (I have hypo.) and did an hcg test to make sure I wasnt pregnant. Once she received the results of the ultrasound, she started me on Provera 10mg daily to induce a period. I am currently on day 8 of Provera and am concerned about stopping it in 2 days. I have been charting this cycle along with OPKs and determined I ovulated the day I began the Provera. I will only be 10DPO when I finish and I doubt a urine test would be positive that early, my concern is that if I did conceive this cycle, will stopping the Provera cause me to miscarry? I am adding a link to view my chart (I didn't keep track of the "baby dance" much this cycle) but everything else is there.

http://www.fertilityfriend.com/home/1bc512