Temp rise but neg opk?

I had a chemical pregnancy 3 weeks ago. I am now on CD 16, I usually ovulate on CD 17. However my temp rose yesterday and has stayed up today... I haven't had a positive opk yet though. Could I have missed my LH surge? I was testing about 2pm every day and didn't pick up the line getting darker so I assumed I'd ovulate around the same time on CD 17. Also, if I ovulated the day before my temp spike that means I didn't have sex the day before O, but I had sex several times a day in the days before and after that. Could I still have a shot at getting pregnant this cycle? Thanks :-)