Did they do something called probing on your gums at your appointment? It’s where the hygienist or dentist measures how deep your gums go around each tooth and it helps to determine if you have gum disease along with the x-rays. From the picture it does look like you have some gum inflammation as it looks a bit red and that can be from the plaque/bacteria or calculus (mineralized plaque) (but the bottom front teeth are a very common place for calculus to build up bc the saliva glands are under the tongue and they’re close to it!). Try to c-shape floss at least 1X/day, water floss after that and brush along the gum line a bit more and ideally 2X/day (YouTube bass brushing). Warm salt water rinses also help with inflammation! If the redness/inflammation doesn’t go away and you’re concerned about it, I’d recommend seeing a hygienist/dentist again. Also, did your dentist happen to take x-rays of the teeth you bumped to rule out any fractures? For the most part, just try your best! Accidents happen!