My experience with an ectopic was painless. I didn't even know I was pregnant. The only reason I found out was because I had some weird bleeding after my supposed AF and was going to have a uterine test. I couldn't have the test because of the bleeding. The doctor made me do a blood test which was positive. All of my home tests were negative. Based on my temps and charts, I was 5 weeks pregnant and my hcg was 32. I had my levels tested 48 hours later and they were 51. 48 hours after that they were 52. They didn't rise properly and were very low for where I was supposed to be. We finally confirmed an ectopic when I was almost 9 weeks. In that entire time I never felt anything. Bleeding is a very common symptom though, as is low hcg levels that rise very slowly.
In my current pregnancy, I had a niggling feeling on the side that I ovulated from. It was the side where I still had a tube as my other tube was removed with the ectopic. I was terrified I had another ectopic. It was very bothersome between 4-5 weeks. I also had a little spotting at that time. Luckily it was just the corpus luteum and so far the pregnancy is perfect.
In my experience an ectopic is painless unless it ruptures. Luckily mine didn't rupture. Hang in there. Your hcg levels are high enough that they should be able to see something in your uterus. Good luck!