Pregnant on first day of period?

So my period started on the 9th it was extremely light- but heavy cramping and on the 10th (last night) my boyfriend and I had sex and he went cummed inside ... 
Everyone keep saying the chances of getting pregnant during your menstrual cycle is like slim to none but I'm wondering "if" because my period was obviously light on the 9th and then on the 10th all day it was "extremely light to nothing" and THEN having sex last night what are the chances now??😓😪
Can there be a chance ?