With just three more wins needed from the final six games to make certain of promotion, Jewell doesn't want an isolated defeat to cause a negative feeling at the JJB Stadium.
He told the Evening Post: "I was pretty harsh on them behind closed doors on Saturday, and on reflection I might have been too harsh.
"Perhaps after a game, when your passions run high, isn't the best time to make a proper valuation of what you have seen.
"Make no mistake about it, the team performance was poor and Plymouth were good on the day. But remember, we are still in a great position and we can't allow negativity to creep in at our place.
"It was only our fourth defeat in 40 league games and as a club, I like us to look forward, not backwards.
"Win, lose or draw, once we get back to training on a Monday morning, it's the next game which matters.
"As we haven't lost many games this season, it's probably more disappointing when you do lose one because we aren't used to it.
"It was a bad weekend for all of us, a bit of a dip, but it's not the end of the world."
Jewell gathered the squad together before training to get his point across, something he admits he doesn't often do.
He said: "Yesterday was probably the first meeting I have had to hold with them this season.
"I'm not really one for meetings because if you hold too many of them, the players might start feeling they're not doing so well.
"But on this occasion, I just felt the players needed a bit of reassurance about how well they have done.
"Perhaps Saturday's result was all about a bit of edginess creeping in because we're getting closer to promotion.
"We don't speak about promotion and just get on with the job, but what goes on in people's minds you can't control.
"The last thing we need here is for us to start panicking. Let's get things on an even keel, we are so close to promotion we can almost touch it.
"Nine points is what we need to make certain and we might not even need that many depending on others results.
"But we want to go out and try and get all 18 which are there to play for – there's a lot of football left yet."
Fans travelling to Huddersfield on Easter Saturday are advised to buy tickets in advance. They are now on sale to season ticket holders, before going on general release next Monday.
Seats brought in advance cost £12 adults, £5 students and Over 60s, £3 Under 16s.
But the price goes up on the day of the game to £14.50 adults, £10 students, £7 Over 60s and £5 Under 16s.
Article from the Wigan Evening Post.