Warning TMI........

Just wondering if anyone has experienced fresh (red) blood as heavy as a period still 3 weeks post partum?

Things had settled down to a pink colour, but a couple of days ago (Monday) I lost a huge clot and heaps of blood came out with it. It happened again 2 days later, and since then I'm having heaps of small clots and pretty heavy red blood returned. If I didn't have the clots I would assume it's a period.

Because I've needed a D&C after both of my other children's birth because of retained products, I'm concerned it's happening again. I went to my GP that suggested a course of anti-biotics and if this doesn't settle it down in a week, I have to go back to the hospital. I have no symptoms of an infection or anything, but Im still a bit sore and just very cold all the time. Like I cannot get warm at all. But I don't have a temp, my temp is actually too low if anything.

Has anyone had success with treating this possible retained products with ABs? Last times it happened after my births, with DS it was 2 weeks PP (but I had a PPH at this stage) and then with my DD it was 6 weeks PP.

I'm just very confused if this is something I should be taking seriously or what? Are ABs really necessary if I don't have an infection?