Help ! ( might be a little TMI )

So this has been happening at least once a month since ive moved in with my boyfriend ...

My discharge doesnt usually have a smell , its rare when it does. But since weve been living together and having intercourse more regularly ive been noticing that my discharge has a smell , even during intercourse. Like i said it happens about once a month and lasts about a few days.

( we dont use protection , and 99% of the time he cums inside. Could that be why ? )

Does anyone have an idea why this would be happening ? Could it be because he finishes inside ? Please help ! 😣 ide really like to know what is causing this and if i can prevent it.