OT: Anyone fell preggers using condoms?

It's so unlikely chances are every article I read, our DD was so planned. We've been faithfully using condoms, 4yrs on after dd we still do. Anyway 3 days now I have similar dark spotting/ implantation bleeding (this spotting also came 1 week before my regular consistent period date) so similar to when we ttc with dd (tested positive days after spotting then), that I can shrug it off.