Got my bfp today but when am I due?

So last month I had a miscarriage (at 5 weeks) started bleeding on 30th March through until the 3rd so of course my cycle was messed up today I took a test and got my positive (over the moon of course) but how can I now work out my due date? Shall I use the start of the bleeding from miscarriage and use that as first day of my last period?

Also glow says I’m not due on for another 5 days that’s if i count the miscarriage as a period ? Please help

Thank you 😇