TMI LOCHIA POST - normal for lochia to tail off and then start again?

I stopped bleeding heavily 2 weeks post partum, and discharge and bleeding stopped at 3 weeks. Been having sex since then, probably around 5 times. I haven’t had sex in a week but this has just fallen out whilst I was in the shower today. Is this normal or could it be some sort of infection? 6 weeks post partum on Sunday. Thanks.