Is there a certain day or time that I should take a test, when on birth control? I know I should use FMU but when should I test? I'm on CD 21 but my withdrawal bleed lasted for 9-12 days and it's been that way for 3 months. I'm on the pill but I'm concerned about pregnancy because I threw up and I have sore nipples. Nausea isn't uncommon for me, but I rarely get sore nipples and I only throw up when I'm pregnant or drunk. Thanks for reading and replying, I truly appreciate it :)