My period is due today. I had a faint positive hpt last month I had my period since then. Both u/s and blood test are negative could I still be preg?

Pregnancy unlikely. A woman is not pregnant if she got 2 negative pregnancy tests, unless she just conceived within the past week or so. Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result by 3 weeks after sex (3 weeks after when conception might have happened).