Leave baby on playmat gym to rest

Am i a bad mom. Im a ftm, baby is 9 weeks old. Baby’s wake period is way longer now he barely nap during the day(sleep longer at night). I do talk to baby often & do tummy time atleast once a day. This is why i get more tired during the day. There are times when i just put him on the playmat gym for him( the one with toys hanging and piano music for his leg to kick) to play by himself while i rest for a bit beside him. But i feel guilty. As im supposed to be engaged in it too? Or is it normal to leave baby on playgym for half an hour or so to rest. I would place the playmat gym on my bed beside me (i wont sleep and definitely supervised). #firsttimemom