I Took Primolut Nor To With Hold My Periods Since

I took primolut nor to with hold my periods since my husband was coming back from work we don't leave together we get to see each other after every 5 or more months, but this time around he came back in between the month from 16 to 20th of August and we were sexually active there he went back to work on the 21. He came back and this month September 3rd now the problem is we had sex and at the end of it there was brown blood on his manhood l was wondering if it's normal doctor because l am still waiting on my period still