Pregnant after miscarriage

I have a question ladies!! So I had a miscarriage January 22-25 and I just found out I was pregnant 2 days ago. How would I calculate my conception date? I’m going to be 5 weeks tomorrow so I don’t know if it’s based off the first date of my miscarriage or last. I haven’t had a period since the miscarriage so it was just an immediate pregnancy. My cycle is usually around 27 days as well