I Had My Last Periods Om 25th April...my Cycle Is

I had my last periods om 25th april...my cycle is not regular..sometimes its of 34 days sometimes 35 sometimes 37 days....i had my urine pregnancy test yesterday it was postive by showing faint lines in 3 4 times..then i had my bhcg that was 2.57 what does it mean..i still dont get periods and having carmpy pain