am i still pregnant?

It sounds like (just my opinion mind you) that you have what is considered to be a "chemical pregnancy"- meaning fertilization but an issue with implantation.  The biggest sign for me in saything this is because:

1)you are on your third cycle of clomid (which does in fact have a cumalative effect with consecutive use).  This happens most often when aid to conception is used.

2) had positive HPT's (those early tests are made to pick up low levels of HcG whereas a doctors office will usually have a beta level that they consider to be positive, it really depends on the office- mine is a level of 30 at or around 15 DPO- for others it can be as low as 5).

3)Your period coming at about the time it should have. Your doctor can't do anything about a miscarriage that early, and absolutely nothing about a chemical.

All I can tell you is to wait after the bleed is done (unless of course there is unusual pain associated  with your bleeding) then try another HPT. Then go from there.  Remember also that your doctor is basically under your employ.  You (either individually or through insurance) are the one that is paying him- if he doesn't act in your best interest or makes you feel stupid for being concerned about a legitimate issue then find another doctor.

 Just a couple of questions for you: 

1) what dosage of Clomid are you on? Which cycle days are you taking the clomid on (3-7, 4-8, or 5-9)? Has the dosage increased since your first cycle or stayed the same? Are you using some sort of ovulation detection (temping/charting, Ovulation Scope, Ovulation Predictor Kits, Ovuwatch, etc) to show that you are responding to the clomid?

2) Are you being monitored while on clomid? The reason I ask is because ovuation stimulation medications can also develop ovarian cycsts (which with PCOS you are prone to anyway).