First told di-di twins, then told mo-di

Nicole • Pregnant with twin boys!!! First time mama. 😍
Unfortunately, I had to switch medical providers around 14 weeks. My first provider was giving me no information. When I went in for my 15 week ultrasound the tech said I had di-di twins and was able to label the anterior and posterior placentas. When I saw my obgyn for the first time at 16 weeks she said she could only find one placenta and told me I probably have mo-di twins. I feel very confused and this whole situation has been stressing me out. Has anyone else had this happen? This is my first pregnancy and I'm not sure what to think.