Had a condom break on what should have been day 21/28 (Oct 21). Took Plan B approximately 10 hours later. Normally, I would not be concerned since it was past the mid-cycle but I recently came off birth control and did not have my period the pervious month. It should have been 9/30 but I only had spotting. I took a blood test to confirm that the missed period was not due to a pregnancy.

Should I be concerned that I am pregnant?

Would a missed period like I had alter my ovulation schedule?

How soon can a take either a home pregnancy test or blood test to confirm?

Anything else helpful would be greatly appreciated!