Should I take a test?

My period is really late I havent had any period symptoms at all what so ever usually I have boobs sore or cramps or something but I haven’t had any symptoms leading up to my period . The last time I had sex was a few weeks ago he pulled out and came on my back and he assures me he pulled out before he came and nothing went inside me , but I know pre cum is a thing. For the past week I been feeling like period is here like something is coming out but when i check all I seen is light brown which is a first for me ? I usually have that at the end of my period . When I wipe I been getting light pink and brown but when I sit down and I feel something down there and i check there’s nothing but bearly a little bit of brown . Is it possible I could be prego??