Hey hun,
ok first off ovulation happens about 14 days or so after the first day of your last period. The 14 days varies from person to person because each persons cycle differs. Second, the chances of you getting pregnant during your period are slim, but there is a chance. To take a hpt my general rule of thumb is wait 17 days after the day you though you concieved or wait until your missed period(i would wait at least a week after the first missed day of your period just in case stress or some other factor threw it off)
for an online pregnancy assesment try this website:
http:www.Northernpennpregnancy.Org/test.Ht
ml
also, if you want to find out when you ovulate I use this website. It tells you when you are supposed to ovulate, when you are fertile, and when you are supposed to get your period. My boyfriend and I are ttc, I really enjoy this site, and find it really helpful.
Http://www.Fertilityfriend.Com
good luck,
casey