It's your baby moving po. Possibly natatamaan po nya abdomen nyo kaya po sumasakit. At 4 months po you will feel your baby's movement such as kicks, jabs, stretching even yung twist and turns nya. 😉 pero kung unbearable po yung sakit, it's better to consult your OB po.
Same here mommy, minsan nakakagulat tska nakakakiliti, Si baby po ata yun. Hehe God bless 😊