Which would be my LMP?

Hi ladies so Aug 14 I had my IUD removed my first period was September 1st. On September 25th I had a very very faint pregnancy test the line never got darker over the course of 5 days. So I went to my family dr urine test negative. Done beta hCG and was a 10 on September 28. That night I started spotting it would start and stop and it done that every day until October 1st and then no more. Never more blood than to fill a panty liner. HCG was back to 0 on 09/30

Well fast forward to now I got my BFP around 10/20 lines have gotten really dark beta hCG are great and progressing amazingly! But what date would I go by for LMP 9/28? or 9/30? The bleeding was only brighter red on 9/30 but had a few very small clots that day. But the first day I noticed bleeding was 9/28. My cycles are 26 days generally.

Thanks ladies