Hey ,
Massive congratulations on your pregnancy , I was advised by my diabetes team to test :
When I woke up , Before every meal , then 1 hour post meals , before bed .
I also tested whenever I thought I felt low or that I felt high . And would also check when I would wake up during the night .
I know some other people on the forum where told to test 2 hours after meals . So I think it depends on what your team advise and what you feel happy with testing yourself to see patterns to tweak and make adjustments .
As for correction , if I was slightly out of target at my 1 hour post meal I would wait untill 2 hours post if still slightly up correct , if I was quiet out of my targets at 1 hour post I would correct . I think along the way you will find out what will work for you and what won't, is hard to keep everything in check but is worth it all in the end .
Hope everything is going well .
x