Seared tuna

I am about 5-6 weeks pregnant and last night I wasn’t thinking at all . I was at a nice seafood restaurant near the water and ordered seared tuna. Afterwards I was worried about eating something that wasn’t fully cooked and I googled it. Then I became really worried about the mercury! I’m not sure what kind of tuna it was maybe ahi. I can message my doctor tomorrow but any feedback from anyone with knowledge on the topic would be really helpful. I hope I am ok if I do not do it again. Some websites say it is ok in small portions.