Thanks for your replies, especially yours TakeruK - sorry I'm not familiar with how to post on here and reply to someone or tag them in a response. Thanks so much for the thought you put into that. I talked a lot with my mom about this, who has been through the Ph.D. process herself, as well as with my partner and closest friend in the program. What I ended up doing was responding to the email and telling them that if they had specific timelines etc that they want me to meet, to please let me know. I then listed all I have accomplished over the past 5 weeks. I really just don't feel comfortable about timesheets - this is something that just isn't done in my department, as far as I can tell. Honestly at this point I don't trust the professor very much, since they sent me this email out of the blue after an in person meeting where everything seemed fine, and after I had emailed them several times the previous week, checking in on where I should be. This also has put our whole relationship into perspective - I'm starting to see that they've never been very supportive or seemed to care much about my research, haven't given me much feedback as a member of my committee early on, etc... so I'm basically looking ahead now to separating myself and my research as much as I can from this person. It might sound overdramatic but I don't really want to give too many details on here.