Confused and sad

Tenara • 23 year old married and prego with #2
So I haven't had a period since July I've always been irregular but I am trying to conceive now I just went to the doctor last week they did blood work I'm not pregnant and I don't have pcos (water the doc says) and no thyroid problems I don't know what else it could be she's wanting to start me on the birth control pill but I really don't want to wait any longer ugh also I've tried fertilaid