Scared of getting pregnant

I really don’t want to get pregnant (especially right now because I’m 19 and a college student... as well as other reasons). So I am on birth control. I’m in a polyamorous relationship (a triad) with a man and another woman.

I’ve been in birth control and have occasionally forgotten but taken my meds as soon as I remember. I haven’t felt too well the past couple days. I had my period last cycle (it was really light from what I remember) and I’m not at the point where my next period is ready to begin. I guess I’m a little paranoid but should I take a pregnancy test to be sure?