Cath, if you are worried about ectopic then you need to get to A&E asap. Just tell them that you have left-sided pain, and bleeding and they will get you a scan right away. (from my experience with my ectopic, they don't mess around with any chance of tubal). The good news will be, if it is nothing, then you get to see your bean (even if it is just a small yolk sac) in the right place all safe and sound. And if something is wrong, you will be able to discuss options to keep you safe right there and then.
Just to ease your mind a little though, the shoulder pain they talk about with ectopics is a symptom of internal bleeding (the blood presses on a nerve somewhere in your stomach cavity which relays the pain to the shoulder of all places) so with you being so early on, I would honestly not think that your tube could have burst already even if it were ectopic (you would be in an unbelievable, on the floor kind of pain if it had). So as far as the left-sided pain and the bleeding goes, it will get you a scan quick which is good. As far as the shoulder pain, I really don't think you could be suffering a burst tube yet if it were so at least that is some relief.
Jeeze that was a ramble, but I obviously learned a lot with my ectopic and just wanted to ease your mind a bit that your symptoms don't mean that that is your case AT ALL, but they will get you a scan very fast at A&E cause they don't mess around with even the possibility.
Good luck hun! I am sure everything is going to be absolutely fine and your bean is nice and safe, and it is just normal uterus stretching pains.