please, help.

Hi… ive a regular cycle of 27 to 28 days. I took ovulation test, both cd 15 and cd 16 were positive. I had intercourse on cd 16… on dpo 5 night, i had a small blood clot, just a size of mini tadpole and ntg else. On dpo 6 morning, 3 hrs after i had intercourse, i had dark brown blood and a mix of light red blood on my pantyliner. On dpo 6 evening, i had brown tinge mix with my creamy cm. And today, dpo 7, i had no bleeding, only creamy cm. My period is due only on 31 oct/1nov. Is this implantation bleeding then? It gets me worried if theres something wrong with my health.