Hi moms✋? I had a routine ultrasound at 12 weeks, everything was fine.…

Hi moms✋? I had a routine ultrasound at 12 weeks, everything was fine. At 14 weeks, after intercourse, I noticed brown discharge? I haven't had this before, this is my 3rd pregnancy☺️ The discharge lasted only one day. Today I went for an ultrasound; they said there is uterine tone, a threatened miscarriage? They prescribed Trenaksa, Duphaston, Utrogestan. Has anyone experienced this? Do these pills help?