So this is weird.. normal?

Hello everyone I am 5 weeks pp I stopped bleeding about a week ago. I had sex last night and it wasn’t rough or anything. I noticed a light bleeding after. I went to sleep woke up still same light bleeding. Through out the day I haven’t noticed nothing. For about 4-5 hours I haven’t had to use the bathroom so I haven’t checked myself I go to the bathroom and my underwear are almost black from where I’ve been bleeding so weird ! No pain nothing. Last night was not my first time having sex either during my pp probably 5-6 times so what is this?