Exercise in first trimester

Hi mummies, can you share your exercise regime? I’ve stopped all exercise, except for gentle walking, during my first trimester - I’m 38 and do not want to risk anything, so I’ve stopped exercise as I get very tired easily. I was worried that I would over tire myself and cause undue stress. I intend to go back to yoga after my first trimester as I am full of aches and would like to build more strength. Wondering if anyone else had advice or experience? #firsttimemom #advicepls #exerciseforpreggyrecommendationpls