Are my boobs shrinking??

true, you've lost the weight now so now its time to do some toning and strenghthening exercises so your body including your chest can tone and look good start lifting dumb bells a couple of pounts each 15x repeat intervals raise arms above head and stretch side to front every day for 30mins you'll notice a difference on your chest because your're working the muscles behind your boobs so now they look firmer and filled out. Good luck.