Why have I been bleeding like this for 2 weeks after sex

Ok so I've been using a Yoni egg and after sex there's been a lot of blood and my cycle has been off this month. Got diagnosed with PCOS through Ultrasound but hormone levels are fine. Haven't taken a pregnancy test yet cause I'm worried it'll be a negative. Been tired more often and nipples kinda sore when sucked on. Also been tested and have had Pap smear in the last year and everything is normal and looks good

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