I got a what I thought was a faint pos last week at 5dpo. Well after the next morning having 5 negatives I knew it was a dud test and it would be to early to test anyways.

So I got negatives 8dpo, 9dpo, 10dpo.

Well today at 11dpo I thought wtf I'll test. Well I got a vvvfl bfp. This time it's lighter than the dud but the dud didn't go all the way up, this does. It's the same Amazon blue hcg test strips.

What are the chances of 2 duds or 2 false positives on the test strips?