On my first pregnancy (ended in mmc) I was getting negatives until af was 14 days late! I know it was a problem with the IC because I took a clearblue digi the next day after the bfp and it said 2-3 weeks so my hcg should have been plenty high to get a bfp sooner! fxd!
I was getting nothing on the promatris brand of ICs when frer was really quite dark so id personally say yes they can but I think certain brands are worse than others
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