Anyone else bleed on their IUD?

Hey ladies. So my IUD causes me to have super light periods and they only last 2 days but I only ever get black or dark brown blood. I recently had sex and I got a sharp pain when we were doing the deed and I instantly started bleeding heavy fresh blood, it stopped the next day no cramping. Well two days later I’m bleeding heavy fresh blood again. I made an appointment but can’t see my doctor for a few weeks. I’ve never experienced this. I was off my period a week before I had sex with him. Has anyone experienced this with having an IUD?

I bled with merena and did have pains but mine fell out unbeknown and now pregnant. Maybe get them to check the position is correct