Help me

Last Month 'July' I missed my period but during the time I was supposed to have my period I was feeling tingling all through my chest to my stomach like butterflies. I was also getting mild, constipated, bloating and had a lot of gas. I have two test both negative one at home one and doctors and now 'monday' I got my period but it lighter than usual so I'm having second thoughts I'm not sure what to think? Now I'm too scared to get my blood results because the doctor reckons it m iught be PCOS