Hi @HRS94 - I completely empathise. It's so difficult, particularly when it seems so many get pregnant first time. I was you at some point last year.
There is lots I could say, including 7 months isn't long and as the NHS say, it can take a year, even for healthy couples. However, I would say this.
I would get the ball rolling with tests around the 9/10th month mark - that is for both you and your partner. Do give it a bit more time and do make sure you're having sex consistently either side of your ovulation peak.
Initials tests should be: CD3 bloods which tests a whole heap of things, then 7 days before you period starts, you can test to check you've actually ovulated via a blood test. Your partner needs a semen analysis. These are the basics to give you at least some reassurance that there isn't something wrong with one or both of you in terms of your fertility. Even outwardly very healthy people, have all sorts going on fertility wise. I wouldn't wait longer than that just because all the tests take time to book, to get the results, to discuss with the doctor or clinic etc. Depending on how you want to word it, you could stretch the truth and do it via your GP who will want you to have tried for a year, or go privately which is relatively inexpensive but depends on your situation.
Hope you get your BFP before testing, but if not, having an action plan can really help you feel better! X