Pregnant again!!!

Lizzie β€’ 23yeatsrs young, one angel babyπŸ˜‡β€οΈ one gorgeous daughter Ava 7/6/17πŸŽ€ and one baby boy Archie 18/4/20πŸ’™
Found out this evening I'm pregnant again!πŸŽ‰ I miscarried last month on the 14/09. This again wasn't a planned pregnancy, but I'm thrilled! Problem is I've not had a period in between. Clear blue test says 1-2weeks. Any ideas on how I can work out how far along I am?
Thanks ladies😘