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i think my Dentist created small gaps between my teeth! need help!?

i've been having problems with sensative gums on bottomrow teeth prior to this. I went to the dentist for just a regular cleaning and i've gone 6 months before without issues (i'm 20 and recently started going again since i was around 19 yearsold) and when they were using a toothscraper i believe, and they were sticking it between my bottom row of teeth fairly roughly and pulling up, sorta seems like they were wedging it between. and scraping between teeth. i spit out quite an amount blood(and tiny pieces of gum) seemed like the whole first cup of water, and i'm noticing i have small gaps now on bottom row! (small enough for tongue to get stuck in one, and the rest feel awkward and sensative)
my question is, is it possible to create a gap with a dentist tooth scraper like this? they said it was "normal" to have small gaps on bottom teeth because of plaque removed but the teeth feel a bit sensative and it's bothering me. i never noticed gaps there before, i think they screwed them up..
my gums were sensative around these teeth prior, as i havent been flossing until recently. the teeth seem to not touch eachother (bottom middle teeth on both sides) but the rest of my mouth is fine. the gaps aren't large so i know filling might be a fix, *but is it possible the dentist created this with a mere toothscraper? x-rays have told me beforehand nothings wrong with my teeth, although my gums felt sensative almost like early perodontal disease or something.
i'm thinking the dentist somehow created it because it almost felt like they were wedging a gap between them, but due to me not being to the dentist enough to know, i figured it was normal to feel a bit of pain. i always thought they are suppose to clean the fronts and around the gumline, but i'm nervous since they felt more like they were scraping inbetween all of these teeth from top to bottom. i'm definately getting a second opinion soon, but in the meantime it has me a bit stressed, since i don't know if it was them who created it, or something else like gums shrinking down, or as they said a large amount of plaque. theyre very noticable, and very uncomfortable. the teeth feel sensative and i keep pressing my tongue against them instinctively.
so then is it not possible to "create a small gap" between someones teeth with dental tools such as a tooth scraper, even while what seemed to be a bit forceful? i've been brushing properly it's the flossing i've always edged away from..