Bleeding but positive pregnancy test?! Wtf

Mrs

I don’t know what to think? I started my ‘period’ on Monday, day 24 which I thought was early and have had heavy ish bleeding since. Yesterday (Friday) I had a colonoscopy and after the procedure they told me I was pregnant 😳 they had tested my urine. Of course I came home and did more tests, all very positive but I’m still bleeding?? Has anyone else ever experienced this? This would be a surprise pregnancy as I have an 8 month old and a 2.5yr old.