New to this...Ovulation testing

So this is what yesterday and today looked like (I tested twice today)

According to Glow predictions I will Ovulate this Sunday. Obviously I’m testing every day to make sure its prediction is accurate and that we time our BD accordingly, but I was wondering if it’s normal for these to be this faint close to my Ovulation date?

Do they gradually get darker or is it just darker on your surge day?

Lol sorry guys if this is redundant to ask...I’m new to this!