late AF but no BFP

Olivia • TTC for 4 years PCOS suffer 💔 Married 27.10.18 💍
I'm late like 2 weeks I've taken two tests both negative and not even a vvvfl. Have i taken test that aren't clear or is my body just not producing enough HCG 
I've been feel sick and had aversion to bacon,chocolate and alcohol. I've got a docs appoint booked but I'm scared this is all in my head.. we've been trying for about a year now and docs have done general blood tests before and I'm pretty much healthy..