I feel like each month I’m starting to spot more and more before AF

The last two or three cycles I’ve spotted for 5-6 days straight then started my actual period.

My question is does this shorten my Lutheal phase? When counting the days of my Lutheal phase do I count from the day after ovulation until I start spotting or until my first real day of AF? When I spot it’s enough that I do have to wear something more often than not. We’ve been ttc for 7 months now and am wondering if this is the reason we haven’t gotten our BFP