Registration

MY TURNOVER IN THE MONTH OF APRIL MAY AND JUNE IS 2.5 LAKH AND THEREAFTER TURNOVER FROM JUNE TO TO TILL DATE IS 18.5 LAKH .
SO DO I NEED TO TAKE REGISTRATION??? BECAUSE IF I CONSIDER PRE GST TURNOVER AND POST GST TURNOVER THEN IT IS MORE THEN 20 LAKH BUT LOGICALLY THE TURNOVER SHOULD BE POST GST I.e. TURNOVER AFTER JULY , WHICH IS ONLY 18.5 LAKH . LESS THEN THRESHOLD LIMIT OF 20 LAKH.
HELP ME TO FIND OUT THE APPROPRIATE SOLUTION FOR THIS.