Judging from the pics I don't see any bud rot. It will look brownish and if you pull the bud it will easily come off.
Thanks i noticed them getting a bit darker around the edges didnt want it to be anything bad ha ha. Its my first grow so im probably being over cautious. Considering its outside in the UK with this crappy weather at the moment its girl scout cookies 10 weeks old i think they look pretty small i have a few others