fondled by my ob? tmi

Okay well,
I dont know if im over exadurating!! But.. when i was in labor my ob had his hand in my vagina for crowning i guess! But i notice him move his thum side to side and then i felt it few more times! Then i moved cause i felt uncomfortable and he took his hand out! I was having contractions! Has anybody had this issue? Am i over reacting? Why would he have his thumb on my clit?  
*update* 
I never knew that it helped with thinning out of i was never told. I has no pain meds no epidural clit is very sensitive and how was i not gonna feel it being rubbed?? Lol  this is my 4th pregnancy and i dont remember him ever doing that! I was consentrated down there cause i was afraid to push the head out that hurts so bad. I took the pain very well i wasnt crying nor was i yelling i was calm. And concentrated cause i was scared to push my babys head out..