so 2 months I had unprotected sex with my husband it wasn't on purpose just got to into if you catch my drift. anyways needless to say I was then got my period 4 days later. light and short as it's been for months last month I was missed my period all together and went to doctors had a blood test for pregnancy took to home test all negative right. this month I've again skipped my period buy I'm still feel like I have it. It's weird! my sister's suggested pcos but I don't know what to do. any suggestions