Girls, can training be in week 21? Something strange happened yesterda…

Girls, can training be in week 21? Something strange happened yesterday, I went outside, went for an appointment, and somehow it caught my stomach from below, like during menstruation, lasted for about 10 minutes and subsided, then started again, subsided completely after an hour or so, and hasn't happened again since. The gynecologist didn't say anything definite. There were no suspicious discharge.