Feeling down :(

I am 23yrs old I have a 3yr old little girl and have been with my husband 9yrs we married in August. We have been ttc now for 9 months I started to do ovulation test last month and I really thought this month would be are time. I've just done a hpt which was a bfn!! It's so dishearting every month when I get a bfn and when af shows up anybody else in the same situation. I really feel like giving up I don't know how many more bfn I can take.