Getting a period a week after having a period???

I think I'm having another period when I just had one. My period when off Sept 23rd. I notice some spotting Oct 1st. It has gotten heavier like a period since then & it hasn't stop. I'm very worried. And I'm getting upset because my fertility week is appearing tomorrow. I ovulate on the 10th. 😩😩 Can someone tell me what is happening?! I just need to know why is this happening!