Does mummy have this experience before?

Hi mummies and mum-to-be. I am currently on my 2nd pregnancy and my first pregnancy was failed as I had miscarriage in around 9 weeks? So I tested positive around end of april and went to checkup in Polyclinic yesterday and its still positive(Just to be sure for myself) And today I had a mild pain on my lower tummy, not the menses cramp feels. recently when I had to go to the toilet, I saw blood clotting on my pantyliner and I am afraid that it is the same issue as my previous miscarriage. As my next follow up appt ultrasound scan will be end of May so any tips or advice on how to prevent this for happening?