I haven't had a period for two months now. i've taken 3 hpt and they've all came back negative. could i still be pregnant?

Very unlikely: Pregnancy I'd very unlikely with 3 negative pregnancy tests. This could be due to stress,diet,exercise,weight,medicines including some contraceptives,and diseases like thyroid disease,diabetes,insulin resistance,PCOS,adrenal disorders,and pituitary tumors.a full history,exam,and appropriate testing are necessary to determine the cause.Hope this helps.