Why...????

My pregnant sister in law always asks me how my TTC is going. I tell her what I am experiencing and she proceeds to tell me that what I am experiencing more than likely isn't pregnancy related since I just got off my birth control 3 months ago! Keep in mind she is 34 and I am 24! Why do people constantly have to beat others down? Every pregnancy and every person is different! Is it bad that I can't wait to find out that I am pregnant so I can rub it in her face?