Pregnant maybe?

So, I have a very precise period. It's 28 days, always starts between 1 and 4 pm, frankly it's great (even if now that I have a paraguard iud it's heavier). It's been like this for about 5 years.

I was raped about a month ago and he finished inside me without any condom (I've had my iud in for 2 years now tho). And now my period is 5 days late. I didn't get any plan b or medical exam after it happened b3cause I assumed my iud would take care of it. I haven't changed anything in my lifestyle either.

What are the odds that I could be pregnant?