I've been having my period on time since one year or more maybe, I'm almost 17 years old. And now I was supposed to get my pms 5 days ago why is it late? PS: I didn't have any intercourse and I didn't change the type of my food.

Stress, changes in boy chemistry,

Or it is just late. Many women are not on an exact cycle and some even miss a month now and then.

And what if I had sex and after it, I got my period on time for 3 months but it's late 5 days in the 4th month, could I be pregnant?

If you had sex 3 or 4 months ago, and had three regular periods, there is almost no chance at all you are pregnant. It would be possible more to have one period after but even that is not as common.

If you think you are 2 or 3 months pregnant, take a pregnancy test ?

If you had sex right before your last period, or during this month, then it would seem much more possible to be pregnant

No, I had sex before 5 days of my period, and after sex I got my period 3 times on time and now it's late 5 days. Thank you please help because it's hard for me to take pregnancy test

And no I didn't have sex again after that