just double checked, actually my 1st rising reading was 6.5 , I then went to the gym , it was after the gym it was 4.9, then 6 after walk, I’ll be interested to see my bedtime reading, all a big learning curve for me, thanks for providing so much information.There are something like 42 factors which affect BG levels. Exercise can raise them initially and then lower them later, or it can lower them at the time. It depends on the exercise and the individual. Usually if it puts your body under stress it will raise them, so getting hot and sweaty and muscle burn will raise them whereas a steady walk for 40+mins will usually drop them.
Did you test before you set out for your walk or was your only other test today the 4.9 (congratulations on that by the way...YAY! a diabetes milestone victory!) If you didn't test before you headed out for your walk, then your levels may have gone up due to breakfast or lunch or maybe stress at work or in traffic or a neighbour dispute or watching a thrilling film can send my levels into orbit.... I hit 17mmols watching Top Gun a few months back and had to inject insulin during the film to bring my levels back down. BG really is very variable throughout the day and night and it takes time and lots of testing to understand how and what your body responds to.
I’m really hoping so, I’m working at everything to revert Pre-D ,If you are anything like me, your waking reading tomorrow may be lower than usual if this is the first time you have been to the gym and walked ie 2 lots of exercise in the day. I find exercise really lowers my BG levels overnight.... but we are all different. You are doing all the right things so you should make good progress and that first 4 is a sign of good things to come.