Have you ever just known you were pregnant?

When I first became pregnant with my son, I just had a gut feeling right from the moment of conception. I have always been super in tune with my body. It may seem pretty crazy but I literally just knew I was going to become pregnant after having sex that night. And I was right. My fiance and I haven't been trying for another one but we aren't preventing either. If it happens it happens. After having sex this past weekend I feel like I have the same feeling I did when I was pregnant with my son.

Have any of you ladies just known before taking the test?