Tetra blood test?

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Hey everyone! I'm 13 weeks and my Dr told me about the optional tetra blood test that I could take at my next visit, which she recommends to everyone. (If you haven't heard of the test it's to screen for the likelihood of downs syndrome and I think a few other things). This test doesn't tell you for sure or not, it's just in ratios. Then more testing is done if you are considered high risk. I'm wondering if any of you have had the test, plan to take the test, or opted out of taking the test? And your reasoning. I'm trying to decide if I should and would love some advice! I am 31, I don't have any family history for anything like this, but there's always a chance. Thank you for your input!