vibrator

So I’m really new to masturbation, and I have been using a vibrator for the past couple weeks and I absolutely love it! my boyfriend loves it as well! Recently when I masturbate and I use the vibrator on my clit, after a little while I feel my vagina start to like almost convulse lol😂im just wondering what that is? (it feels good) is it a physical orgasm? and will i squirt? (not sure if i even can but i am lovingggg this!)