Good evening. The last 12 weeks started yesterday. I have pain in my l…

Good evening. The last 12 weeks started yesterday. I have pain in my lower abdomen when doing something or walking for a long time. Like during my period. To the doctor only on Monday. And I also have a uterine fibroid, 13mm. Some say it might be a miscarriage, others say there's nothing to worry about, it shouldn't happen.