Ovulation kits: Anyone have pretty dark lines for day before surge?

I’ve used the digital OPKs in the past, but decided to go with the cheaper ones this time around. I’m likely still a few days from ovulation based on past experience (I ovulation like CD16 of 28), but I’ve been testing for a few days already and the lines seem pretty dark! They’re definitely not positive, but I think I expected them to be lighter than this.

Anyone have pretty dark (but not positive) test lines leading up to ovulation and be able to conceive okay? I think I’m convincing myself I’m going into premature ovarian failure. 😓