If you've had an ectopic what did you feel?

I'm just shy of 5 weeks.. Been having some cramps and pains that I thought were gas but mostly on my left side... 😢 I'm really worried because I had an internal ultrasound right at 4 weeks and nothing was seen in the uterus.. So if you've had an ectopic or a rupture what did you feel, and what if anything did you feel leading up to it? 
I see my doctor tomorrow but I don't know if he will send me to repeat the scan. I am not bleeding or even spotting at all. 
Thanks in advance