I had my period on the 5th of June, finished on the 12th on the 24th of June I had what seamed like a full period that ended on the 29th of June, I have had unprotected sex and wondering if I could be pregnant?

You can get pregnant any time you have unprotected sex -- and even if you use birth control. (Ask some members here who used even three forms at once and got pregnant.)

I'm worried about the 2 periods in 1 month I have never experienced any thing like this before I have 2 children already and wasn't sure if their could be any other explanation to the 2nd period besides pregnancy