Security Clearance w/ Recent Marijuana Usage

Hello everyone, brand new to reddit if you're wondering why this is a new account.

I recently got a job after a super long job hunt after graduating and turns out it needs a security clearance. I had no clue before applying (didn't show in job description) and now I'm extremely nervous since figuring out. I just started the process of going through filling out the SF-85P information and I'm starting to freak out a little because I have recent marijuana usage.

I was hoping to get some insight to see if I'm just SOL with this or not. I use occasionally (once a month) but my last time was around a little over a month ago now. I don't mind never smoking or doing anything with marijuana ever again as it's not a huge part of my life, I just don't want that small decision to ruin my chances with this clearance. I feel like an idiot for doing this because if I don't pass this clearance, I'm probably going to be let go and have to go back on the job hunt.

Any advice or input would be greatly appreciated. Thank you.