cramps! advice please?!?!

I am about 6 weeks pregnant with my first baby. Iv been getting cramps at around 4pm every day for three days, they are in the middle of my lower abdomen and feel like period pains, they are quite painful but only last a few minutes and then they go away. I have had no bleeding or spotting at all. I went to see the doctor today and he said he wants me to go for a scan tomorrow to make sure it's not an ectopic pregnancy. He said it's unlikely but they want to check to be on the safe side. Now I am completely panicking!!! Anyone have any advice or had similar symptoms???