Today 5wk2d had a scan as had some light pink watery discharge. Gynae say only see sac. Is it normal

1st beta hcg at 600+ on 24/05, 2nd beta hcg at 2000+ on 27/05. Today is 5wk2d my dr did a scan for me as these few days I had few episodes of light pink watery discharge & cramps. As I had recurrent miscarriages before can't help but start to worry as only managed to see sac today. Dr did mention the sac is in the right place. My next scan will be next monday. Just wondering is it normal to only see sac today as my previous pregnancy scans were not so early at 5wk.