welcome to the forum,
thank you for the consultation.
since you have the history delayed irregular cycles by 10 to 15 days, i would suggest you to go for a pregnancy
test at least 7 days from now.
the expected date for your menses was 4th may ( thinking the cycle to be of thirty days).
however if this cycle is a delayed one by around 7 to 10 days , you might have ovulated in this week and conception may occur, which will give a positive test report after a week or 10 days.
may your dreams come true.
wishing you all the best.