Pls HELP

Ana

AF is due today in all my app besides FF. (Since I started TTC in November, my cycle has been 26-27 days plus one very long that’s including my miscarriage in December). My temp dropped yesterday and I thought AF would show up today for sure but for my surprise today it keep the same temp from yesterday. What this means? Do I still have chance? Is the temp now to low for be to be prego?