I had sex one week ago with my husband, but unfortunately it was very painful, and since then I've been experiencing burning & itching, I also noticed some creamy odorless discharge, I took some anti biotic, but now the itching has ease to some extend, but the discharge is dark brown ( close to blood color) and still odorless... Should I be worried?

Was the antibiotic prescribed to you for a specific reason related to the burning and itching? Did you see your doctor about a possible infection? If so, what was diagnosed? If not, that would be something to consider doing.

Get thee to a doctor.

They're more credible than a group of volunteer internet forum people. Especially when you're experiencing something like this. I would recommend a full range of tests. No nookie until it is figured out too. Could be symptomatic of something serious.