If you're two months late you'd be getting a positive HPT by now, so definitely make a trip to see your OB/GYN as to why you're not getting a period! Good luck!
Ask for a quantitative blood test. :-)
Your hcg levels might be too high to defect on a test.
It's very rare for HPT to not be able to withstand hcg, you can take a test at a point in your pregnancy is at the highest point, it will still show positive.
Thanks for all your help I went to the doctors and my pcos made my estrogen really low and my thyroid is acting up which caused my periods to stop.