I had sex 4 months back. Took ipill. Now has 2 months of amenohrrea. One month back did upt twice 1 week apart. Both time it was negative. Last week did one abdominal ultrasound. It showed normal. Uterine size 7.9�4.5�3.8 cm and endometrium of 7.5 mm and no adnexal mass. Today done serum betahcg and it was less that 0.1.i have pcos with irregular periods. Can I still be pregnant? Is less than 0.1 miu/ml of bhcg abnormal or invalid result? Should I check bhcg again? Is it possible for me to be still pregnant,