Positions with an iud

Anna
Okay ladies I need to know if I'm being paranoid or not. Sometimes when he fingers me, really deap I think I can feel something? Almost like pressure, it's to the point where I don't want him doing that anymore because it freaks me out! I'm also too scared to go that deep during sex😫. I've had the mirena for about 3 months now. 
Also, I tend to cramp everytime I lay down at night. It's not like the cramps are severe, I just wonder why it only happens at night?