Do you ever just KNOW?

Elizabeth

Did anyone ever just know they were pregnant? It's month 14 TTC, first round of Clomid, 8 DPO. During one of our BD sessions I had this really invasive thought that just kept saying "that's it. That's the one that made the baby." And now I'm awake at 4 AM and I just have this feeling. I've had some cramping the last few days, and I woke up to hot flashes and nausea. Am I crazy? Or is there something to the whole "I just know it" concept?