ok just let me rant: You're not an expert. You have ZERO right to rain on someones parade. Every woman is different, and yes, you can just "know" you're pregnant. I'm in my 30s and i have 2 children. With my first, i just knew i was pregnant. I had no real symtoms other than a nagging suspicion. I was very young (19) and yet, i knew. Please stop bashing women with "facts" because you read here or there, this or that. If your bitter, i get it. Post for support, dont attack other ladies because of it. Im tired of seeing y'all be mean. This is such a delicate and emotionally upsetting time. You know that. Lean on each other. Have your opinions but be supportive. Were all in the same scary boat.