You shouldn't be concerned if you feel a little bit dizzy on occasion. Your body is under a significant amount of stress right now, so it's only natural that you feel off-kilter at times. You can try to avoid the spins by transitioning slowly from sitting to standing, lying down to sitting, and so on.
It's also very common for even the most dentally conscious of us to experience bleeding gums during pregnancy. There's no need to switch up your oral hygiene routine; the culprit is simply the increase in your body's blood supply to sustain the pregnancy.
Fetal movement is common by this point, but by no means guaranteed. Try not to stress yourself out if you've yet to feel baby's first kick. He'll do it when he's good and ready, just as he'll tackle every other milestone for the rest of his life on his own unique timeline.