How far along am I?

Kinsey • I`m 28 my DH is 41 we have 2 beautiful daughters that are ours as well as my wonderful bonus son and daughter. We are currently pregnant with our rainbow baby after having 3 miscarriages earlier this year.
Okay so the last period I had was really weird it was very light and long which is unusual for me. that was Feb. 18-25. My normal period her for that was Jan. 21-24 . so I wondering we I would be due?