persona monitor!!!

hi all,
im thinking of buying the persona monitor to see when my fertile days are, but everything i have read says you have to start using it on the first day of your cycle but i am on day 2 but still having AF, i was going to get it next day delivery as really dont want to have to wait until next cycle, so does anyone know if i can set it to recognise me as being on cycle day 4 which is what i will be when it is delivered??
if anyone can help that will be great!!!
xx
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