Baby Aspirin??

Sa

Saw a MFM doctor today for my anatomy scan and I was referred to them by my OB office due to high BP in my last pregnancy. The MFM doctor told me to start taking low dose aspirin until 36 weeks. He wrote down 81mg, 2 tablets every evening. But I see a lot of other mamas only taking 81mg a day. Is 2 tablets too much, should I just take 1 a day?