This is widely considered to be the most accurate non-invasive option out there. It appears to be roughly 98% accurate. [3] X Trustworthy Source PubMed Central Journal archive from the U. S. National Institutes of Health Go to source A sonographer may be able to make an educated guess at 11-14 weeks. It won’t be a 100% positive result (at 11 weeks, the accuracy is about 75%), but you can ask the ultrasound technician or doctor to give it their best shot. [4] X Trustworthy Source PubMed Central Journal archive from the U. S. National Institutes of Health Go to source

There are blood test at-home kits for this as well. They make sense in theory, but the results aren’t reputable. There’s just no way to know what the lab you’re sending the blood test to is doing with the sample, so you can’t trust the results. [8] X Research source

These tests are invasive, and they’re typically not encouraged if there isn’t a specific risk the doctor wants to assess. Talk to your doctor before having either of these procedures. There may be side effects, and there’s a very minor chance that they’ll induce a miscarriage, so don’t get one of these tests if you don’t need them. [12] X Trustworthy Source Johns Hopkins Medicine Official resource database of the world-leading Johns Hopkins Hospital Go to source When it comes to determining biological sex, the accuracy of these tests is around 90%, so it’s not the best option for sex determination anyway. [13] X Trustworthy Source PubMed Central Journal archive from the U. S. National Institutes of Health Go to source

Many patients opt for this test specifically because it’s an accurate way to determine a child’s sex. However, it can signal that you’re at high risk for genetic disorders, even if your child doesn’t have that disorder. Talk to a doctor to weigh the pros and cons of getting a cfDNA test. [15] X Research source

The size and location of a baby bump[17] X Research source The size and symmetry of your breasts during pregnancy[18] X Trustworthy Source PubMed Central Journal archive from the U. S. National Institutes of Health Go to source The severity of morning sickness (although extreme morning sickness could possibly mean you’re having twins or triplets)[19] X Research source