Gaining weight quick 😱

Jennifer β€’ I'm a mother of 4 & currently prego with baby #5 due 07/12/16 with baby Aiden πŸ˜πŸ’™. Been with the hubby for 10 yrs πŸ’πŸ‘°
Took a pregnancy test on Tuesdayand came back positive. According to Glow im 3 weeks 6 days, Due date July 15,2016. Im a tiny person and I've gained 3pounds already in a matter of 2 days. Is it normal? Lol