Periods after m/c?

i had a complete m/c nearly 10 wks ago (no dnc) on the 23rd of may, i got my first period since the m/c on the 23rd of june, i have been actively BD this month, i thought my af would have came on the 23rd of this month ??? is it normal for your 2nd period to be late as its nearly been 6 days ??? advise greatful thanks x