Progressing too slow?

Lynn

I was supposed to start letrozole next month for baby number two but yesterday i decided to test since we haven't been using protection and bam...faint line. I tested yesterday in the afternoon (14dpo) so i wasnt surprised the line was faint. I tested again this morning with FMU and another faint line. I feel like i had much stronger lines at 15dpo with my daughter. Left pic is 14dpo and right is 15dpo.

should i be worried?