MIL kissing my belly.

So over the weekend my MIL walked up to me and, without asking, bent over and started kissing my “belly.” I am not even 13 weeks pregnant and any belly I may have was hidden in intentionally loose clothing to avoid this kind of stuff. She did this during my first pregnancy as well and I never said anything bc I was too worried about making it awkward. The thing is, our relationship is rocky to begin with (she has trouble with boundaries/appropriateness and also substance abuse). I no longer feel as timid with her bc I’ve been forced to confront her on other issues since my first pregnancy - so I would’ve said something to her, except I was just so taken off guard (though I guess I shouldn’t have been surprised). I’m feeling frustrated bc she seems to feel entitled to my pregnant body (she has also demanded that I “show her my belly”). Bc of my weird relationship with her, it’s sometimes hard for me to distinguish when I’m being overly sensitive to when there is really something crazy weird happening. So my question is how would you feel about this? Am I nuts for feeling violated?