Pregnancy at end of menstrual cycle?

I know that at whatever point in your cycle you have sex unprotected there's always a chance of pregnancy. But my husband and I had sex and the condom broke and I was a day away from the end of my period. I have a 26-28 day cycle. I feel off this week as I get my period in 5-7 days and my breasts hurt horrible. They normally start hurting right away in the month but they started hurting 9 days later than normal and before they started hurting it was an on and off dull ache.  I'm not sure of when I ovulate but glow says it's about 5 days after my period ends.