Lifting at Work During First Trimester

Hi, everyone. I'm 7ish weeks along and my job requires me to lift ten gallon jugs of water (according to Google about 80 pounds). I've been reading women shouldn't lift more than 25 lbs while pregnant? My first OB appointment isn't until around my 10 week point, so asking my doctor is out. Should I tell my boss I'm pregnant already? Haven't even told family yet. Has anyone else been in a similar situation? Thanks in advance.