That's something I experienced in 1st tri, I also had part of my vision go in one eye. I did go get checked out after informing my midwife, the dr ran all the checks, bp, neuro and urine, all fine was put down to been a migraine which I do get but this was totally different.
It is a symptom in pre-eclampsia to get visual disturbance, but pre-eclampsia doesn't usually start until your over 20 weeks but my mw wanted to be safe and get me checked out.
Dr did say if it didn't settle then to go to the optician but it went within a few hours.
Hope yours settles as quick as mine did. x