bleeding

So I had the Skyla put in in April of this year and I've noticed some break through bleeding which my GYN stated is normal while my body regulates to the hormones. I've noticed that not always but a good amount of the time that if I have sex whether it's rough or not that I will spot for a day or more after sex and sometimes even bleed for a few days. I've gotten it confused with a monthly cycle since I don't receive one normally every month but this month is the second time I've been bleeding and cramping heavily a few days after sex. We use condoms and lube due to vaginal dryness from this IUD, and it is not painful during sex, I just don't know if this is regular for someone with an IUD or if I should be concerned, I've mentioned it to my GYN and I'm waiting to hear back from the office I was just curious on some feedback ?