Weird luteal phase change! Possible?!

Got off birth control a year ago. Started temping in April. Since then my LP has averaged 15 days (sometimes 14 or 16.) I’m currently 12dpo and started getting some brown discharge yesterday. It’s turning reddish but super light flow (mostly only when wiping). I had a temp drop too so I’m expecting AF but it’s really early. Is this atypical? Fertility consult in January (though I’ve been pretty regular, we’ve been trying for five months and I’m 35 so we’re going in). My current chart and two previous are below.