pregnant?

Jessica
Hi ladies. I'm 8 days late from my expected period. My last period was 9/7-9/9. I experienced brown spotting 9/14-9/16. Now this week, I have had sore nips and constantly peeing. I've taken a few pregnancy tests but they all are negative. The last time I took the birth control pill was for the month of August. Should I wait a few days to take another test? How long did it take for your test to come back positive after a missed period?