I think with a IUI you can't test until you miss your period because the hormones they give you can cause a false positive on a hpt. I have heard of women getting positive opks and being pregnant but I am not sure how accurate it is. I know a opk test for the LH surge to happen and a hpt test for the hcg hormones, seems they test for two different hormones. 3 days past iui is too early to know for sure with a hpt. With my daughter I was negative at 11 dpo and positive at 12 dpo with firsts response.
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