IUD HELP

I just had my doctor check on my IUD after placing it 3 months ago. I couldn’t feel my strings, but he said he found them so I trusted him. WELL, after sex each time I’ve had a tiny bit of spotting just once immediately after. I can feel him hitting my cervix so I figured that was fine. THIS TIME, sex hurt a lot. I have endometriosis so that is normal for me, but I also had diarrhea today so when it hurt in my stomach during sex I thought it was just because it’s sensitive with the tummy ache/stomach bug. I haven’t had a period or spotting with the IUD hardly ever. Now after this time with sex and it hurting in my stomach I’m bleeding and hurting a bit more than normal. I am not bleeding through any pads. I’ve attached a photo. We still use a condom and I check if after, so I know we are safe with that backup. I just got checked last week... should I go BACK into the doctor for this? Should I be as concerned as I am? I’m freaking out. Help 😭😭

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