I just bleached my roots a few hours ago (actually my boyfriend did most of the work

), but anyway, I left it on for like an hour to get it to a yellow-blonde (using 30 volume) and then washed it out. I shampooed my hair twice, taking care to scrub my scalp so that no bleach is left on it.
But now, I still feel some itches at times. Is this normal? I checked some parts that itch and my scalp seems to be its normal colour and I'm pretty sure (or at least hope so) that after 2 washes all the bleach must have left my hair. At least there didn't seem to be any bleach visible when I looked.
Is it just a normal feeling after bleaching? Maybe my scalp is just sensitive and dry after what it's been through? I have some slight itching at other places of my body that got washed a lot today (like my face and hands), so maybe that's it?
I'm just wondering if that has happened to anyone, as it's my first time not having a professional around when I did my roots and I'm a bit scared of having done something wrong. :p