Differences between cramps?

So I'm only 5w1d but I've been crampy more than normal the past few days. I was just wondering if someone could describe/explain the difference between ok, normal pregnancy cramps (my friends called them growing pains) and bad, you should probably call your doctor. I was Aldo wondering if you can have a chemical pregnancy/miscarriage without bleeding and just cramps.

I'm sorry I'm such a worry wart. It's my first pregnancy and ttc took less than a month so I'm just a little shocked (good shocked) all together that I'm pregnant and this is happening. I'm going to the doctor tomorrow for a welcome visit but I rather ask you lovely ladies for personal experience rather than a doctor giving me a look of madness.