Late period

Catherine • Mom of twins 🌈 👶🏻👶🏻
February I stopped taking birth control, my husband and I sometimes use condoms or use the withdraw method... After I stopped my birth control my period came in the right time in March, no problem at all. My last period was on march 25th, I'm 9 days late. I did a pregnancy test and it came out negative, do you guys think my period is just messed up since I stopped the brith conteol? And how many days should I take another pregnancy test that will be more accurate?