help again please?

Alysha • I`m Alysha I have one beautiful daughter who is 4. Me and my husband of 4 years are trying to another baby!!!!
I posted yesterday about having a little bit of blood come out, not a lot only lasted a day and a half. The color was pinkish brown. If it was implantation bleeding, how many days after should wait to take a pregnancy test? My period isn't gonna come until a week and a half.