Advice about cramping please

I have been having cramps on and off all day today? They had stopped for a while now. I’m 13 weeks and 4 days pregnant. I’m worried that I might have done something to harm the baby. I’m not spotting or bleeding and they aren’t heavy cramps. Yet I’m concerned. I set up a early appointment to see the doctor for tomorrow but I wanted to know if others experienced this and if it’s normal. My doctor says I shouldn’t worry unless it’s heavy cramps and bleeding but I’m worried regardless.