Am I pregnant?

Cari • 29. Mama of 3. MC in December 2015.💙 Rainbow baby girl born April 4th, 2018!!!💗🌈
My period was December 22nd-25th.... But I just took several pregnancy tests yesterday, and one this morning and they are positive. Is it possible that I'm pregnant after just having my period? I have a doctors appointment tomorrow, but I am still curious, and nervous. Could an embryo survive that? What are everyone's thoughts? Especially if you have experienced this!