soooo dark

so my periods haven't been to the date perfect. I'm not 100% on the first day of my last period BUT I say around the 13th of July, I ovulate about a week after my 4 day period. I got a BFP about a week ago. this seems dark to me..idk...is anyone else's this dark that's close to my sch?? we weren't ttc. my youngest turned 1 today. we weren't preventing it but not actively trying either. thoughts?