Can someone help me understand

Slvelaz✨✨ • 👯‍♀️ 1 Ectopic 2 MC 🌈=11/04/19 🤰due10/01/21

I started spotting on Jan 1 for like 3 days then I had a light/reg period for 3 days after the spotting and then spotted again 3 days ...... I hope that makes since ... I got multiple positive pregnancy test I guess would be a week befor next period. So my question is do I calculate it from when the spotting started or the regular flow?