Irregular periods. Kindly advise!

Hi,. I'm 26 old. Till now i had never faced Irregular periods. But On April 1st week i had Sexualy connected with my partner. But No Intercourses happened between us and this for sure. Don't know if slightly has just touched or not. On April 29th I had my Period With Dark colour But Bleeding lasts for only 2days and from 3rd day bleeding has completely stopped. On May 30th It was just Spotting and was only 4-5 Drops for whole day. Period has not happened in may and there is no symptoms as well. Even i have done pregrency test in the Morning for twice in prega news, Both the time result is negative And Today is 03/06/2021 still there is no periods happened and there is no symptoms as well. From last one year, I'm working in night shift but never faced irregular periods. I'm so worried. Kindly Advise