I’m pregnant! But I can’t figure out how far along I am considered?

I recently found out I am pregnant with my third, but I can’t figure out how far along I am/ due date. I have an 19 month old, and I am still currently breastfeeding him. My cycles returned in December, but they were 35 day cycles (start a new cycle on day 36) how far along would I be considered if my last period was on the 24th of August?