Do you all believe in sympathy symptoms?

As far as 2 people who are close, for instance me and my twin. We just found out she is pregnant 2 weeks ago, and crazily enough I knew she was pregnant before she even thought she could be. I kept having dreams about her every night and finally pushed her to take a test and it was positive. Since then, I've been getting heartburn, nausea, back pain, tender breasts, I'm even a week and a half late for my period! But I tested twice last week and it was negative. I actually believe me and her are so close I'm having her symptoms, I mean, like I said, I even knew she was pregnant more than a week before she took the test. It's freaking me out. Do you all believe in this or could there be some other explanation?