Bfp after period

I had a very strange short period I started off spotting but got a red flow for 3 days then back to spotting. I am still having sore boobs so I decided to take a test and bam positive. I’m so scared I miscarried my baby but I’ve heard women sometimes can bleed red blood and still have a healthy pregnancy. I’m going to the hospital this morning but just wanted some insight and if anyone had a similar experience please share