I'd definitely bring this up with your gynae or PD soon, especially since you're getting pain in that area when you cough - better to rule out anything like a pulled muscle or something that needs a bit more attention than honey alone can handle. A week-long cough in pregnancy can be tricky because you want to be careful what you take, but your doctor can suggest safer options or check if there's something else going on, so it's worth getting checked out just to be safe.