applying for TRV while your spousal case is being worked on does not hurt your spousal app.As far as I know, no you shouldn't. You have 99% chances of being declined and it can hurt your case. What stage is your file at? Normally it takes 12 months and even longer if it's 2nd marriage, age gap etc.
but it is true that most likely they will decline the visa if you are not able to prove strong ties to your home country such as a lot of funds in your bank and a stable job back home etc.