Now what?

Jessica • Ttc #3 32 years old
OK so I got a bfn on blood test today. Oh well I can't be upset or too bummed I have 2 kids & just started TTC again. With that being said my question is when do I start trying again? I am not going to but ovulation test yadda yadda this time cuz....I can't spend money on em and it worked before lol and I am still not bleeding .....if I skip a month what's cycle day 1 ?