Extra feeds on the weekend will support your milk supply during the week. so it will be all good! To be honest, with my little one I went back to work full time when he was 6 weeks old and by 10 mnths I was over it. So, I stopped expressing at all during the day and fed him morning, nights and weekends. When I was away he had food and water and he breastfed for a VERY long time (over 4 years) Babies have a knack of getting what they need