How do you deal with the worry!

I’m currently 15 weeks pregnant with my 4th baby I lost my 3rd 10 weeks into my pregnancy and had a missed miscarriage resolved by a d&c

Everyone is so happy for me but I just can’t seem to stay excited and always get flooded with waves of doubt and sadness that something bad is going to happen

It hasn’t been a smooth pregnancy so far either which makes me not want to get attached I’ve had a massive bleed and a large perigestational haemorrhage and a marginal umbilical cord placement

The stress is doing my head in I can’t wait until Monday for my next appointment so I can hear babies heartbeat just to know everything is okay in that moment

Any tips on how I can get over this fear?