changes in stool and weight loss

Hello ladies! So I have been sick for the past two months with stomach issue but I recently just found out I'm about 7 weeks pregnant. I've been having diarrhea for the last week and a half and it went from yellow to green. I've also lost 6 pounds in the last week even though I have not thrown up. I know it's common to lose weight during your first trimester, but I feel like that is too much. I've had stomach issues though for the last 2 years and no one could figure what is wrong with me. Is this something I should be concerned about and should I call my OBGYN? Thanks!