Zika virus TTC

Hey all
My husband has just got back from a business trip to Bangkok Thailand. 
We had a miscarriage in April and have been TTC since. He took all the precautions against mosquito bites but still got a few. He has no Zika symptoms. He is having a blood test tomorrow to test for the virus present in his system. 
I wondered if any doctors on here knew if blood test will definitely show up positive if he had the virus in his system at all? 
We really don't want to have to put a temporary stop to our plans and really felt this month would be the month 😭