At 1 month and 4 days, your baby is still super tiny, around the size of a poppy seed or maybe a grain of rice, honestly napaka-small pa lang, you won't even see much on ultrasound yet! Most moms don't find out they're pregnant until around 4-5 weeks kasi yun na talaga ang time na makikita na ng OB on scan, so don't worry kung parang walang development pa, it's completely normal at that stage pa lang talaga.