When I pregnant with the first it is very easy to pass motion normally. However, for second pregnancy between 7 weeks to 11 weeks I can't pass motion. During that hospitalization I requested for lactulose on top of other medication prescribe to me during my days in the hospital. But I was not admitted due to constipation, it was because of other medical reason. If you feel that your stool is watery and every few mins of visiting restroom could be stomach flu virus. You should be visiting the nearest clinic to get proper medication otherwise it will trigger your pregnancy.