Does your temp start to go up after your period? Mine went up 0.40 and period ended today. (New to BBT - sorry if it’s a dumb question)

Also I’m on cd 3with a negative opk but it’s darker than yesterday so I think I might have been missing my surge every day for the past 3 months and BD’ing on the wrong days?

Is it possible to start getting lines on cd 3 - now obviously I’ll start to monitor if they get darker day by day and eventually become positive but just wondered if anyone learned they ovulated really close to when their period ended?

Thanks. xx