Okay so me and my boyfriend had sex for the first time about a month ago.
He didn't use a condom but he pulled out before he cummed.
Right after I bled slightly and I had pains in my lower abdomen when I urinated
Now a month later, I've been getting cramps [which usually happens before my period]
So I`ve just been thinking that its just my period because it should be coming tomorrow
But today I started having pains again when I urinate
Also when I urinate, I have a slight bit of blood
Not regular [period] blood, just a light kind.
This has never happened to me before
So am I pregnant or is this just because it was my first time?

It sounds as though you may have a UTI (urinary tract infection). You need to be seen by a doctor to be sure, but if so you need to be on antibiotics as that is the only way to completely treat a UTI.

Understand that the withdrawal method is not a form of birth control at all. Please read this sticky for more information.