When is a good guess for my due date?

Bri • CNB 07.07.17💙 HKB 06.24.20💖 SBB 01.31.23💖

So I tested positive last night when it had been exactly 7 weeks from my most recent miscarriage. I did not have a period in between so I have no idea how to guess at what the due date may be. I don’t track ovulation and I’m honestly shocked that I got pregnant so quickly! Anybody can give me an idea of what my due date might be? I know it’s impossible to know for sure obviously just want an idea! I’m happily cautious as i have had two miscarriages in less than a year. I miscarried on September 9th