Line is really dark


I got a positive on the 10th and It was 6 days before my period and I took one today my app says I'm 4 weeks 5 days but I think my line is super dark for 4 weeks and 5 days

This was my first test on the 10th 6 days before my period

This is my test today

Could I be further along or maybe twins I heard sometimes if u get a dark line it could mean twins