Spotting and mild cramping within ovulation week

Hi all, so my period stopped around last Wednesday-early Thursday and specifically today, my abdominal cramps have been crazy and I was spotting slightly after I went to the bathroom last time. I had protected sex on Sunday and know for sure nothing broke or was off.  I have had an IUD for about 5 months now and am just wondering if this is normal and if it's worth calling my OBGYN about because the spotting/bleeding hasn't been noticeable other than during my bathroom trip. Thanks.