so i haven't had my period for 2 months. i last had my period on Jan.9. i took a hpt this morning and it came out negative. i do have irregular periods. but i've been feeling different for a while. i don't have the morning sickness, sore breast. i have been feeling nauseous once in a while, i've gained weight, i have been feeling tired lately, backaches, abdominal pain, excessive saliva, headache (which i never have), and i urinate frequently. could i still be pregnant????