Aww I wish I could help! But sometimes a person may never get a positive hpt even though they are pregnant. I for one, my last "period" was just like you described, when I usually have a 5-7 day period. I got a negative result up until I actually missed my period. Now I have an apt on sept 2nd to find out exactly how far along I am.
When are you due for your next period? I honestly would schedule an appointment with your doctor, no matter what that nurse says about waiting, because if there is something actually wrong, you would want to know asap! This way, you can also get blood work done to see if you are indeed pregnant and you don't have to stress yourself about with waiting.
Keep us updated, good luck!