Do you ever just.... Know?

Immediately after sex, the though flew through my brain 'that probably got me pregnant'. And I was right. That was may, 2014, and I had my son the following Feb. Then, December 26th, 2015 I had the same exact thought following intercourse. Both times I had had unprotected sex multiple times within that time frame. But those two moments I remember very well.

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Am I the only one who gets that thought? Because I just had it again the night of the 11th. Now to wait and see if my subconscious is right. The waiting is the worst.