Half blue lines outside 10 min window?

Va

Hey guys, I am 4 days late. Took a test this morning & got a negative. Looked at it a few hours later & saw a half blue line.

Took a second test in the afternoon & it was also negative. Then 40 minutes later it was ALSO a half blue line... thoughts?!

Worth noting I recently stopped nursing my first LO about 1.5 weeks ago & have had regular periods before this.