Hi, I'm A 28 Year Old Married Woman L've Been

Hi, I'm a 28 year old married woman l've been missing my period for two and a half month now and there's still no sign of it. I've taken an ultrasound and blood test so I know I'm not pregnant and no sign of hormonal imbalance, no infections or cancer either ;). Dispite having history of PCO (poly cystic ovaries) there's no sign of that now. I usually have acne's around my period which I still do at the due time with a very light abdominal pain and random spotting. I'm not stressed either. I've checked everything I could think of. Coyld there be any other causes? What can I do other than go on hormonal pills?