Not really. The last volume (#13) sold 144.506 copies in 12 days. This volume (#14) sold 182.561 copies in 14 days. Divide the amount of copies sold through the amount of days respectively and you get this:
#13: 144.506 copies / 12 days = 12.042 copies/day
#14: 182.561 copies / 14 days = 13.040 copies/day
Volume #14 just sold 1k copies more per day, which means volume #14 should have sold around 156.480 copies in 12 days, just 12k more than volume #13.
For comparison: The Promised Neverland had a bigger boost from volume #3 to volume #4 than Black Clover's volumes #13 and #14 have.
│*94969 (6)│122494│------│------│------┃*,247,320 (104)┃2017/04|約束のネバーランド 3
│134300 (6)│182819│209882│******│240991┃*,240,991 (*34)┃2017/07|約束のネバーランド 4