About menses. I visit my gyno again.

Last month my date was 18 june but i experience some kind of blood spotting from 7june i am sexually active from last month then i my dates are not coming my gyno prescribe me deviry 10mg after that i got my menses on 30 june but again this month i expereince a light spotting after exercuse of or from 22 i experience white fluidy discharge from vagina i had no pain nd no itching .But i am worried about this month should my periods come on 30th july bcz i did not experience any periods symptoms .did by taking deviry last month my dates will be irregular i am hell worried about this .because this is happen firsr time with me I had a regular a regular cycle since my menarche and i am taking care of myself better .I did exercise ignoring junk .I am fit but why this happen to me pls suggest me .should i visit my gyno again.