I also get palpitations on and off. Mine are stress related and ease off over time. Cutting out all caffeine for pregnancy seems to have reduced their frequency as well.
Also had my 20 week scan today. I might have the wriggliest, most stubborn baby I have ever heard of. At the 12 week scan, we couldn't get the nuchal measurement as baby was too active, then fell asleep in just the wrong position. Once again, the sonographer really struggled to get as many of the scans as she did since baby was constantly moving arms and legs, while at the same time, outright refusing to move from the back out, footling breech position it was in throughout. As a result, the spine and arms shadowed all the heart scans, and we didn't get any decent photos to take home, so I go back next week for a second attempt. I remain (and hope to stay that way) team yellow. I'm also on the growth pathway as my uterine arteries were borderline for it, so I get extra scans as well. I was already consultant led due to high BMI, family history of diabetes and now as due to the (low) possibility of an IUGR baby.
The weirdest part was that I truly believed that all the movements I had had was gas since: a. First baby, b. Feeling them since 16-17 weeks, and c. I'm very overweight, but it turned out it really was my baby all along! Amazing to see the movements on screen match all the sensations I was getting. Baby also gave me a hard double footed kick straight to the cervix during the scan. Charming child....