I guess it's a loss..advice?

Hi ladies,
So it's been a roller coaster. I got my BFP 2/19 and started bleeding the next day. I called the doctor they told me not to worry blah blah blah...kept getting positives until yesterday. Took another hpt today just to check and it's a big "not pregnant." I guess it takes awhile for the HCG to go low enough? Any advice...I'm heartbroken and now I'm on my way to work (I'm a teacher) so I'm not sure how I'm making it through the day. Also, my first appt is Thursday..I need an annual anyway..do I call and tell them?