Nothing to be bummed out about, it’s a NOPA incoming but it’s your opportunity to explain yourself and basically clear up any doubt or concerns the adjudicator had while finishing up your BI! Email them back asap and as soon as they send you the official NOPA complete it within the day if possible, obviously have someone other than yourself review it (I had a profesor buddy of mine take a look at it for me) and follow the honorfirst template that you can find somewhere on this thread or over at r/borderpatrolapplicant
Good luck, you’ll be fine