Vision changes in pregnancy?

I have had random vision changes since i became pregnant... Im in my 12th week and it started about a month ago. Its starts with a blotch in both my eyes and it seems like it blocks out half of someones face or its pretty much like its blocks out half of my vision completly and then its turns into a blurred spot in both eyes and then that goes away but escalates into me barely being able too see anything and my side vision goes out and i cant see anything too the sides.... And then get this it turns into a huge headache!!! Has anyone experienced this before or have any answers one what i can do or what it might be??? please ?? thanks