starting to get worried ... hospital time?

Ok so I have an IUD (Mirenya) (sorry for poor spelling) I've had it for about two years now it's always been a little painful around period time but periods are only 1-2 days , yes I know normal! But for the past month I've been cramping and last night me and my man tried to have sex it lasted 1minute because every thrust was like someone was stabbing me in the tummy ! Anyone have any idea why? Ps period is two days late am I pregnant? Is baby pushing on the IUD making it uncomfortable?