cheers, i was woried the cardio, would make me lose weight, and muscle
That's an outright lie, myth, dispicable rumor, etc that has bodybuilders getting fatter than they have to. Belive me I was one of the 'no cardio while bulking' people for a long time - what a mistake!!
20 minutes of moderate cardio training postworkout is not going to do anything but good for you. It will help keep the fat off, aid recovery, and increase your endurance and cardiovascular health. If your diet is right, you shouldnt lose any muscle. Now, 60+ minutes of cardio every day might be a different story - but in moderation,
everyone should be doing their cardio. At least 20min 3x per week, IMO.
Ziricote gave good advice in small, incremental increasing of caloric intake in order to promote lean gains. You can also implement strategies like caloric and carb tapering to help minimize fat gain...and as much as I hate to admit it I think its a big help to work out first thing in the morning and plan your meals around that AM training session.
BV