What is going on in my mouth?

Last night i flossed the area behind my last tooth that was just gum obviously because there is no tooth there. Well i woke up this morning and there was a bump in that spot that i flossed. I pressed on it alittle and its pink and alittle squishy but not alot. Last time , which was very recent, I went to the dentist they did not say anything about any wisdom teeth coming in so im not sure if i just hurt myself by flossing to much or if they are actually coming in.