you can be pregnant. as your next period is due on 4.5.13 so you will have to wait till the due date.
as you are feeling pain in left pelvic area it doesn't seems to be related to pregnancy
. it might be due to some other cause
as you had one miscarriage
there for you should be very conscious regarding pregnancy.
if your menses extends from due date go for urine pregnancy test and consult to your gynecologist