I'm on my 21st week and experienced vaginal bleeding last night after pooping..i pooped twice yesterday. one before lunch and one after we ate merienda

Sis consult your obgyne to check if it is really from the vagina or from the anus. Your obgyne can give you info on what to do next. It happened to me twice (in the vagina) but ruled out the spotting. My OBgyne gave me a uterine relaxant to take up until I will give birth.