Has anyone here become pregnant, even while using condoms correctly?

I've been off the pill for 4 months and my periods have been very regular, occurring on exactly the same day each month. Since I got off the pill my husband and I have been using condoms as our only form of birth control. None of these condoms broke or seemed ineffective in any way. We did have sex once without a condom where he pulled out, but that was a day before I was supposed to get my period.

Well, I have missed my period. It's 6 days late. In my entire life I have NEVER missed a period. Infact, I've always been very consistent (the only exception was while on BCP, one time my period started early after making drastic changes to my diet).

I have been stressed lately, a lot has been going on, but even then I have never in my life been 6 days late. 2-3 days late due to stress max.

I have been very, very tired for the last week and yesterday and today I have been nauseated and threw up once.