So I got my period back in May after EBF baby for 9 months. I've had 3 periods with a similar gap between them (my whole life I've always been regular.) But this time I am like a week late over the average gap. So I took a test today and waited around 5 mins which appeared negative. I came back to it a few hours later and it looks like this... super thin vertical line which looks like it's cut in half. What do you guys think? I've heard of evaporation lines too...