Miscarriages

Hi mumma's,
This year I have had 2 natural miscarriages this year at around 4 weeks. After I went to the doctors, had blood works done, ultrasound and examination. I was told there was nothing wrong and I had a healthy uterus and it was most likely problems with the baby and to keep trying. I am now 2.5 weeks pregnant and scared it's going to happen again. I already have healthy 6 year old son and didn't have any troubles conceiving him. I seem to be able to get pregnant straight away but not being able to hold them after 4 weeks. I just can't get excited or happy this time as I just feel like it's going to inevitably end in a miscarriage again soon. Did any other mumma's go on to have a successful pregnancy after several miscarriages?