How long should i wait to take a pregnancy test after my last period.

Week after missed on: Generally, wait a week or more after your first missed period for the test to become valid. The test usually will be positive about a week after conception.

Pregnancy test: Generally wait for 7-10 days after missed period to do home pregnancy test. If negative, wait few more days & repeat. If still negative & certain you're pregnant, see ob/pcp for blood pregnancy test.