Vibrators and pregnancy *tmi*

So I’m 30w3d pregnant. I found my vibrator(lost it in my closet somewhere for literally months) and so of course I was excited to use it. Anyways while using it my uterus tightened and like pulsed(freaked me out) It literally felt like it was going to explode. When I used just my hands it might of gotten tight feeling after I was done, but not like this. It worried me that like I was going to make myself go into labor lol. Baby moved just fine a few minutes afterwards but now I’m scared to use it again.

Anyone else use toys and experience this?