Official scorer issues

[comical]

I keep the book for men and women's games at a D-III school. Last night in the womenÂ’s game it was late in the second half, one team had 8 fouls, the other team had 9. The team with 8 charged fouls committed a foul. I had a brain freeze and was confused about the number of team fouls and which team had committed the foul. I told an official that it was the tenth foul and it should be two shots. Fortunately for me, a timeout had been called just after the foul and before the free throws. I realized my mistake and notified the same official before free throws were attempted.
While I lucked out this time, IÂ’d be interested in hearing any comments about how I might avoid this in the future. The visiting team didnÂ’t have anyone at the table keeping a book, so there was no help there. IÂ’d be interested in hearing anyoneÂ’s comments about this or comments in general about important things for scorers to know when keeping the book, especially when doing it solo, as often happens here. Thanks.