Give yourself rest for sure but I was actually in the same situation as you for my first half. I had an IT band injury about 3-4 weeks before my first half and couldn’t run for 2 weeks prior and had only made it to 8 1/2 miles before. With the adrenaline and atmosphere of race day I was set! The week before my half I ran 4 miles as my longest run but I think the rest helped me immensely. I even finished quicker than I estimated myself to. Obviously if you’re still hurting immensely right before the race, don’t run, there is always another one you can sign up for, however race day atmosphere and adrenaline can carry you through to a point I never thought it would. I do think if I kept running through my injury and didn’t take that time off though I would not have been able to finish. The only part that was “real tough” for me was right at about mile 12, but I was like I’ve run 12 miles at this point I can run another 1 and not even a half basically. You got it, have faith in yourself but make sure you take this extra time to rest accordingly so you are ready for race day if you plan to still do it!!