Pregnant and just stopped birth control. How do I calculate my due date?

cristiT09

Hi all, I just got my BFP 4 days ago! We were shocked because it happened so fast after coming off my BC. I hadn't even had a period yet. I'm wondering how do I figure out how far along I am. Do I count day 1 as the first day of withdrawal bleed? Or first day stopping the pill(stopped mid-pack) Here's the timeline: October 3rd I stopped taking the pill. I got a withdrawal bleed the 5th-8th of October and found out I was pregnant (4 BFP tests) November 8th. I'm feeling nauseous, sleepy, and crampy now so I would think I'm maybe 5 or 6 weeks? Help!