I've had my belly button pierced since I was 18 and I'm 24 now and I've NEVER had it bleed while I was on my cycle. That IS NOT normal and you should remove it immediately and see your doctor ASAP to avoid and serious health risks!!
Yes, you could still have a period and be preg. You've taken multiple pregnancy tests and they're positive however you still have a perios that is VERY much possible. It happened to my cousin. She had a period until she was about 4-5mths pregnant. I hope this helps!!