Hello and welcome! You said you tried charting, are you still charting? If not, keep it up so you can continue to track whether or not you are ovulating regularly. OPKs can be very useful tool in helping you know when to time sex. Also are your cycles regular? I ask because I have read stories from women who have regular cycles and start taking vitex only to have it mess up their cycles. Vitex is generally only recommended if you have irregular cycles or a hormone imbalance.
How are you timing sex currently? If possible, you may want to have sex every 2-3 days after the last day of your period just to make sure you are hitting your fertile window.
I have also been ttc #1 for 8 months. Unfortunately I have not ovulated and I can confirm this with temping, charting and using OPKs. I am taking Women's Balance by Gaia which has vitex and black cohosh to help regulate hormones. I am not ovulating or having regular periods so that is why I am taking this supplement. Also, keep in mind it can take a healthy couple 12 months to conceive. I am at the 8 month mark as well and I think it is BULLSHIT, I want to be pregnant four months ago! But alas, here I am on BnB TTC forum searching for support and offering support to others. I noticed this is your first post. I highly recommend reading through other threads, posting replies and offering support to others as well to generate some good will and positive karma.
Good luck!