Hi - I've been in pretty much this exact situation...I had an ectopic (at 6weeks). My only symptom was bleeding (zero pain) although I did have a slight 'stitch like' feeling the day before I started bleeding. I went to the ER at 8am and didn't have surgery until midnight!
When we feel pregnant this time I had a scan at 5weeks, 3 days to check it was in the right place as I was flying to the US a couple of days later.
The scan really put my mind at ease although it was too early for a heart beat.
Good luck x