Been TTC for four years

Roxi

Me and my partner have been trying for four years now we had a chemical last year he has a low sperm count and I’ve had to have laser treatment on my cervix I’ve been getting all the regular symptoms I have three different apps that are telling me I’m 3 weeks and 5 days I’m 12DOP I’m AF isn’t due for 2 days and my test are negative can anyone help me understand please because I’ve seen other peoples posts were they’ve had positives at this stage.