How far along am I?

Laura

So, I had a miscarriage in January when I was 5 weeks so just like a heavy period. The first day of this was 4weeks ago today. I ovulated late this month on day 19. I had a positive test today (clearblue digital) (yay!). So I know you use the first day of your last period to date it, so in that case I would be 4weeks today. But as I ovulated 4 days late, does this mean it pushes it all back 4days, so I’m only 3 and a half weeks?