I think I'm pregnant and want to tell my ex

I think I'm pregnant. I took a test but I took it too early so it was negative. I want to tell him about what I am experiencing but we got into an argument over the weekend and we are not talking or on good terms. So I think telling him will make him think that I'm doing this because I want to keep him around. Which is definitely not the reason! I practically missed my period(spotting for 3 days). I really want to tell him but I guess I should wait until I take a pregnancy test again in a few more days?