Period sex

Hey everyone. So my husband had been out of town for a month on work I unfortunately started my period the day he came home. My periods are fairly normal and are always about 4 days long. We BD a lot...... All threw out my period. My period ended up not being very heavy and only lasting about 3 days.. (It turned into just spotting on the third and fourth day..) my question is, can I get pregnant on my period? We have been trying over a year... And the only time we avoid sex is my period. So, wishful thinking this will be our lucky month...