I’m late...Please Help.

I’m 3 days late on my cycle, I’m never late always at least two days of spotting before my cycle starts. Now my boyfriend of almost 8 years and I have been trying to conceive for a few years now. And I’m nervous because the other day I felt nauseous, queasy, and dizzy. I did not get sick at all now he’s saying that I’m pregnant. My breast are semi sensitive, abdomen is a little tight, overly emotional (I haven’t taken a test yet to see if I am, I’m scared if it says yes or no). What should I do?