how far along are you hun? you came off the pill 5 weeks ago yeah? But the doctor tested your hcg at 2-3 weeks? Usually at around the '2 week' mark you are not even pregnant...you are ovulating, so your hcg would be nothing (or very low), as pregnancy is measured from you last menstrual period...so the week you have your period you are 1 week pregnant already.

I hope everything goes well with your test today, try to not think about it too much