Hi. Morning sickness is most common during the first trimester but can occur during any phase of the pregnancy. As for the diarrhoea or bowel irregularity, this can also occur during any phase in pregnancy but as long as it does not lead to dehydration, it is not something that should cause any concern either. Other symptoms of threadworm include insomnia, bedwetting, itching around the anal region, bedwetting, skin infection, etc. Diarrhoea is usually not a symptom associated with threadworm, although it can occur, it is not due to the threadworm. You can choose to visit your doctor and get examined, but in my opinion it seems unlikely. Also make sure you ask your husband to help with taking care of your daughter, and also use separate rest rooms. Best wishes.