luteal phase question?? Anxious!

Hey ladies! I'm learning so many things on this TTC journey I'm on. I have a question about the luteal phase. So I get a peak on my clear blue ovulation kit on CD15. Then, I always have three days of spotting starting on CD26, before AF starts on CD29. Since I always have the spotting, I know it's the start of AF, which makes my luteal phase only 10 days, right? (Assuming I ovulate the day after I get peak, on CD16.) My question is, isn't this too short for a luteal phase? Should I call my doctor and tell her my concerns? Or does anyone else have a shorter luteal phase like this and it's just normal? Thank you for any responses! I'm still TTC #1 after a MC in September.