When to test?

So, I had unprotected sex a few days before ovulation. He didn't cum in me, but very very close. My period is now late, and it never is. I'm nauseous, and super tired and dizzy. My boyfriend said I've been very moody too. I'm not here to say that I didn't know what I was doing, because I did, and I have no problem taking responsibility for my actions.

Should I test? And if so, when?