I had an experience of this with DD. DH and I had planned to have a baby later in our marriage, but my mum, who had chronic lung diseases, became so much worse in the year running up to our wedding that we hurried things along a bit. We were married in October and I was 6 weeks pg. She ended up in hospital with a collapsed lung in the December and ended up at a specialist hospital after our local tried an op to re-inflate it, only to have the other one collapse. She had several drains and was very poorly.
She missed her birthday and Xmas (her birthday is the 19th).
This all happend during my first, very scary trimester.
In the second trimester she went on the transplant list and leapt to the top of it due to the severity of her condition. In March, on Mothers Day when I was 28 weeks (I think, its hard to recall), she had the op and had both lungs replaced. The op was a succes, but she spent 11 days in a coma afterwards and during her recovery period contracted 2 seperate infections which almost caused her death. On 2 occassions we prepared for the worst, but she pulled through. My daughter, her first GC was born in July and my sister recalls telling my mum on several occassions that she was born; my mum was so ill in intensive care that a) I couldn't visit and b) she couldn't hold onto information for long.
She finally met my daughter in a hospital cafe when DD was 6 weeks old.
In September she finally discharged from hospital (I visited often with DD, using the hours car journey to get her napping!).
The whole experience was shattering and exhausting and horrendous, but we all got through it.
I hope that your mums tests return hopeful news and that your pregnancy goes smoothly. Like the previous poster says, let your antenatal team support you. I was too stoic and wound up being signed off in the May, I think it was. Look after yourself and your bump.
(apologies for the essay...)