hi - you can still keep up your exercise but watch heart rate and body temp carefully...
diff ppl take on diff advice about diet - it sounds like you have a good balanced diet so thats the main thing but there are some things to avoid esp for listeria - i think there is an article on here and also yu can google and lots of resources come up. It is personal choice really how far you go with restrictions but good to be informed.
I am still swimming 1.5kms each day and doing lots of walking and yoga... but i did cut out a lot of higher intensity exercise for risk of injury... that was my choice. swimming is def my preg fave, esp in later stages it just feels wonderful.

good luck with the rest of your pregnancy - what a wonderful time.