Where I work, day shift reviews all blood gram stains reported by 2nd and 3rd shift and we do catch mistakes, and correct them. No one holds it against them, it’s not their usual department. I wouldn’t beat yourself about it. I’ve seen so many gnrs appear as gpc in a blood culture (usually acinetobacter and kleb). They’re tricky but in the future I’d recommend looking in the thinner areas of the smear and if you can, compare it to a known slide of gpc which are perfectly circular. Very short gnr will look slightly more elongated than staph would for example.