Delayed periods. Days. plz let me know!

Hi myself 32yr old female my name is swetha I have Thyroid for that I take thyronorm 100mg And it's normal I had PCOD aswell for which I took and crisanta and mycod for months With regular workout and diet I have reduced considerable amount of weight and my cycles are normal now without any medicine Every month I get periods on 4th day of my actual date so cycle is 33 to 34 days Only once in a while I get it on 10th or 12th day This time I saw some light brown discharge after urine on my 4th day of my date (I was supposed to get periods on that particular day) I had sex with my husband on previous night vigorously since he was in abroad we didnt had sex for 3months Next day I saw some light brown thin discharge  only in. Morning without any cramps I did not get my periods after that .I don't know was that was that actual periods or jus spotting or my dates are yet to arrive I'm tensed again .I do lots of workout and diet Do I get my periods after few days .Plz let me know