3DPO and I 'know' I'm pregnant.

Okay I've been posting a lot recently and I know this sounds crazy because supposedly it's impossible to know you're pregnant so early. However, the morning after, I woke up feeling very crampy (I don't normally cramp during Ovulation and period cramps are light) and they haven't stopped since.

During the evening it's worse and my stomach feels achey and full and tight and it's almost a pulling sensation. As crazy as it sounds, I'm just wondering if anyone has ever experienced this before?

I keep telling myself it's in my head but last night I woke up so achey and crampy in the middle of the night and just feel different.