Late period ?

I had sex two times two days after my fertile window ended with a condom in which he entered raw for about three strokes at the beginning and then put the condom on for the rest of the time until we finished. And we didn’t have sex again. Now my period is late about 6 days. What are my chances of being pregnant ? I have been cramping and my breast feel sore yet this is how i usually feel before my period but idk ... but I was on strong antibiotics called isoniazid . What do you guys think ?