Could i be pregnant if i had sex during my period?

Okay...i had sex on the fourth and fifth days of my period and it usually lasts 6 days...it is now the seventh day and i am lightly bleeding...we are trying to conceive and were also trying to conceive before my period started...is there any way i could be pregnant? Is there any way i could get pregnant while on my period? I have a short cycle about twenty four days...and i realy want to have a baby...can anyone help? And when should i take a test? 