confusing lines

I had a bfp on 7dpo in a wondfo. I had a blood test done at 8dpo and it was negative. Yesterday at 10dpo I had a temp dip and very light spotting. Decided to use a fr today and I get this. Granted it wasn't fmu because I never pull a bfp in the am. I always get them in the evenings. I see a line clearly but I wasn't sure. I opened it and still see it but could this be the deepest indent I've ever seen? I know it's invalid once it's opened but it shows the line much clearer for the purpose of a pic. Af is due in three days so I'll test again if she doesn't show up but what do you think? I included the wondfo so you could see it was positive.