Weight loss

Kelsey
So I'm almost 16 weeks along with my second baby and I weigh less now then I did before I got pregnant. I was recently admitted to the icu for sepsis due to a kidney stone that blocked urine from leavening my kidney. I'm on antibiotics and pain meds and have absolutely no appitite. I have lost a total of  4 pounds. Just wondering if anyone else has had issues with gaining weight.