ok first off it doesnt matter if he didnt ejaculate in you
precum can get you pregnant and HE doesnt know feel or control precum and niether do you.
secondly, if your period isnt late then stop worrying about it.
third, periods CAN be irregullar. even if youve had regular periods your entire life that means NOTHING. you can have an irregular period anytime.
third- if it was "too wet" down there it could be from you not just him
if you miss your period take a test. because we dont know if your pregnant or not
only the pee stick does