Missed period. Regular m really tensed!

I am 28 yrs old female unmarried and sexually not active..I have 35 days of cycle..in December my period got delayed so I got done my usg pelvis and tsh which was normal thn I got it automatically on 45th day after dat it was normal in jab then in Feb I took primolute n on my docs prescription as I had to go out so as I left tablet I got my period on 12 March and in April May b due to effect of pills I got it a week earlier on 6th April but in May again got late it would have come by 11 the may but yet it has not come today is 44th daay I repeated my usg it's showing normal and tsh was 5.8 so again I repeated my free thryroid profile which showed normal value of 2.26 now plz tell me wat should I do and how can I make my period regular m really tensed