Working out + Mono

Hey guys. I officially started working out/ lifting weights rigorously in January. I’ve seen some changes and strength which is awesome. I tested positive for mono 3 days ago which means I won’t be able to lift weights for at least a month. I’m really upset because I’m new to this fitness thing and I feel like I’m going to lose all my gains that I worked so hard for since I started in January. Any advice?! I’m a female 5’5 currently 150-151 pounds. I’m trying to lost fat and gain muscle. Since I have less of an appetite should I take this time to lose some fat— or what? I don know what to do truly. My goal is to probably get around 140 and look lean with muscle and most importantly be and feel strong— but I know to do that I have to listen to my body I just can’t bare to think about losing all the hard work I did- especially since my muscles are so small. Any input would be helpful <3