Luteal phase 7 days

We have been trying for 3 month, (no time at all I know) and my first LP was 9 days, then 6 days and now judging by my temp drop this morning it looks like 7 days. I am taking 100mg b6 plus pregancare. Should I see at Doctor? I am in the UK and am worried they will  brush me off because we haven't been trying for a year. I read your posts about the dreaded 2ww and am jealous because I only get a week 😊. Does anyone have any advice? Thanks in advance x