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A strong beta number at 17 days after fertilization (14dp3dt or 12dp5dt) would be over 200 miu/ml (or iu/l, they are equivalent). One study of 523 ivf pregnancies found that betas over 200 iu/l at this time had the greatest chance of success. Hcg levels depend on various factors, including fresh versus frozen embryo transfer, day 3 versus day 5 transfers, when the test is performed, and more. Generally, hcg levels under 5 miu/ml will produce a negative pregnancy test.