At a loss

I've been TTc for 5 months now after a miscarriage. I got pregnant on my second month of trying so this is killing me.

Last few months my cycles were averaging 26-28 days. I ovulate on day 17/18 this means my Latual phase is 10-11 days.

Last month I took pregnancy vitamins and additional vitamin B6. My cycle was 34 days last month and my period was a little heavier. This month I stopped taking the vitamin B6 and my cycle went back to being 27 days O on CD17. This time it's very bright pink and watery not a lot but enough for a pad.

I don't know what to do? Should I keep taking B6 to help extend my cycle after O or just leave it and hope for the best?

I'm sick of trying now all my friends are getting pregnant and I feel so alone. Like it's never going to happen for us. 😞