Very lethargic

Hello! So I am 19 weeks today and some serious lethargy, weakness and shortness of breath have hit me in the morning when I wake up. I just had a UTI scare turn out to not actually be a UTI so I am a bit reluctant to call my doctor. Could I just not be eating enough? I feel like I’m eating as much as I can but definitely not as much as my last pregnancy. I have way more aversions this time. Is this something anyone else has experienced? It honestly feels like my blood pressure or sugar is super low.