This may sound silly but.....?

my cycle was always 35 days till i had my second child in july last year. it was then 28 days. i then had a early miscarriage at exactly 5 weeks at the start of april this year. it then went from 35 days again, 31 days, 31 days 31 days. now going by the 31 days it will be today. no sign of af showing up and i got a bfn!!! the last 4 times being pregnant (2 kids, 2 miscariages) i got a bfp 2 days before or when i was due. do u still think there is a chance i could be pregnant???