Ashkenazim extend the Talmudic prohibitions of shavua shechal bo tisha b'av (the week of the 9th of Av) to the beginning of the month. Are there Ashkenazi leniencies from Rosh Chodesh Av until shavua shechal bo that reflect the fact that the prohibitions during these days are not from the gemara?
According to the Kitzur Shulchan Aruch 122:5, cutting nails is only forbidden during shavua shechal bo.
קציצת הצפרנים אין לאסור רק בשבוע שחל בו תשעה באב...
Cutting the fingernails should not be prohibited except in the week of the 9th of Av.
(I wouldn't have known this if @Danny Schoemann hadn't posted it to his Halacho a Day blog a couple weeks ago.)