IUD strings missing and cramping

I’ve had my Mirena for almost 2 years now and haven’t had any cramping since it was initially inserted. I had one period after that and haven’t had one since. So 3 days ago at work I was cramping lightly. I thought it was my pants being too tight so whenever I got home, I put on some lose pajamas and laid down with my son. I got up about an hour later with these cramps still but they were a little bit more annoying. So fast forward to yesterday, I called my Gyno and they told me that they weren’t going to be able to see me until late July and they told me to go to the emergency room if I still was cramping or if I started bleeding. Has someone else had this happen? I had my fiancé try to feel the strings and he couldn’t feel them. I’ve checked for the past 3 days now and still can’t feel them. Should I go to the ER before work tomorrow? The cramps feel like second or third day period cramps (the intense ones). I’m having my normal symptoms feel a period (TMI but I poo a lot whenever I’m on my period) but I’m not bleeding. I slept almost the whole day away on the second day because of the cramps. HELP!