I had a surgery to remove a small polyp scheduled a few days after my the period. Then it turned out from bbt chart that I ovulated on the day of surgery. Cuz on the next day, my temp rose for a week, which may be due to the after effect of surgery. However, on 7 dpo today, my temp suddenly dropped. So I thought AF was gonna come today, but it hasn't. I really hope I still have some chances to get BFP during this cycle. What usually does a sudden drop in temp mean? Baby dust to you all.