Cramping with Kyleena

So I had unprotected sex with my boyfriend on November 5th, he didn't pull out each time. I've been having some serious cramps since then & were just had unprotected sex a few times tonight (with no pull out) & I am having AWFUL cramps. Is this normal? I got my Kyleena the last week of August so I've had it close to 3 months now.