Oh god, having bad morning sickness while chasing a toddler is next-level torture! Having a gap of at least 3 years makes sense so the elder one can play independently while you are dealing with pregnancy nausea.
Medically and practically, doctors recommend a gap of at least 18 to 24 months before conceiving again. This gives your uterus and nutritional stores, especially iron, full time to replenish properly.
Take your time, don't rush into another pregnancy quickly. Your body has gone through a lot, so wait for at least 2 years so you are physically and mentally ready for round two.
After a loss, both the body and mind need gentle healing before trying again. It's so important to give yourself at least a year or two to recover completely so that your womb is strong and ready.
My kid is a toddler now and running behind him takes all my energy. I would suggest keeping at least a 2 to 3-year gap so you get time to recover and enjoy your first one's baby years properly.
I can't give medical advice, but in my experience, keeping a 3-year gap worked wonderfully. My first child was potty-trained and thoda independent, which made handling the second pregnancy much easier.
I got pregnant again when my first was just 14 months old and I panicked so badly thinking it was too soon. Honestly, it was chaotic initially but seeing them grow up like friends now is actually so beautiful and normal.