Pregnant...maybe? Please help!

Ok so I have very irregular periods, we're talking 45+ cycle days. Usually when eve says I'm gonna get my period, it comes within the next few days or within a week. It's been 19 days... even for me that's odd. I'm worried I might be pregnant.

There have been a few times that my bf and I will have sex, first without a condom but we always make sure to pull out, wipe off, and then we put one on. Even with condoms we always pull out.

I bought 2 types of tests- the line one and the read out. I haven't used them yet because I'm not sure if I should wait until morning (since I heard the urine wouldn't be as diluted?)

So I guess I'm asking:

Is it possible I am pregnant? Is it late because I am stressing over it? Should I drink as much fluids as possible to take one of the tests? Or should I wait until morning? Please help!