I had my last sex in the month of June and then I got my period in July. But this month I am late... could I b pregnant??

Sure you could be... but you're probably not.

So how late are you?

While it is rare, to have a period, ( may have spotting that appears to be period) or sex a few days before period. But normally if you have your period, you are not pregnant.

First, how late are you, 2 or 3 days is not "late"

While you could be pregnant, but most likely not, there are dozens of reasons to be late for period, even miss one now and then.

But if you are 14 days late on this period, do a test with first urine of the morning, as soon as you wake up