Old test?

I'm still 6 days away from my period but have been extremely moody and queasy for the past 2 weeks. I've also been staying up super late with my husband since he works second and I'm a teacher so I'm off on summers and ofcourse we've been eating a lot of junk food at night. I found a first response pregnancy test in my make bag from about 6 months ago when I missed my period (ended up being sue to stress).

I checked the expiration date and it is still good until december 2019. Is the test still most likely a good test? I plan to test again later tonight with a band new test but wanted options.

Update: I went ahead and took two more tests I just bought just because i kept thinking they would come back negative (yes i know that's not possible but I'm sure everyone understands the feeling). I'm deffinitly pregnant and we are super excited! I have my first appointment this friday!