It could be, it could... keep an eye on it and if it were to get any worse just go straight in to A&E ok?
With ectopics they can mimick appendix issues, A&E departments have ultrasound scanners and whilst they may not show up on those it's just worth a check, they can give injections to help it , some places will treat it before doing bloods,
I had a suspected ectopic as well, the test was negative but the dr was pretty sure of it going by symptoms, within about an hour I was in hospital gas and air and had to have methotrexate. It was the side opposite the appendix but the ovary and appendix are very close so pain can mimick one another. Infections can cause high white blood cell count definitely.... nausea is a biggie. Make sure you keep hydrated and eat and if you get a temperature just go right in. i'd keep a bag full of things just in case... and prepare in case you need someone to look after your girl whilst you go in.. just in case