Can heavy bleeding wash out sperm or prevent implantation?

I posted before about bleeding after a bowel movement and conceiving. I am now 3 days post ovulation and today after a bowel movement I began bleeding heavily with blobs of blood and cramping. It lasted about 3-4 hours and is now subsiding, but I'm still worried if it will affect conceiving. Am I just worrying too much?

If you are bleeding heavily such that it can "wash" sperm out of the cervix, then it will decrease the chance of getting pregnant. If it's just spotting, it shouldn't affect it.
Since I was 3 days after ovulation when the bleeding started, if I conceive this month, then conception had already happened before the bleeding started. So I guess what I'm really worried about is if the fertilized egg will be able to attach itself if I am steadily bleeding. As of today the bleeding has slowed but not stopped.

Implantation occurs about day 5-7 after fertilization. It implants in the uterus usually in the top or top-back on a very small area. I see why you are worried about the bleeding. If it continues heavy it could prevent implantation. It's still very possible, however, so just wait it out to see what happens.