Can someone help me understand

svelπŸ’– β€’ 2πŸ‘©πŸ‘§ 1 ectopic 2 πŸ‘ΌπŸ‘Ό 1🌈 born 11/4/19

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?