I do sadly have experience of toxoplasmosis in pregnancy. It was a lot later on though, and I lost my DD at 20 weeks (no heartbeat at 20 week scan). We only found out as a result of a wide range of bloods drawn when she was born that I had a massive toxo infection. I then conceived again just 6 weeks later (before we'd had the appointment for the bloods results when the consultant advised a break of 6 months to allow the infection to die down and my own immunity to develop) and a very stressful pregnancy ensued with extra consultant scans to look for damage. Thankfully all was fine and that baby is now nearly 5 years old.
At the time we were told we just had to wing it through the early weeks with the question mark of toxo effects on the new baby. Apparently the antibiotics they give to pregnant women to counter toxo (spyromycins) are not licensed for the 1st trimester.
I did a load of googling and found that even catching toxoplasmosis didn't necessarily mean it would be transmitted to the baby, and the effect of toxo infection depends on gestation. If a toxo infection is transmitted to the baby during the 1st trimester the likely outcome is an early miscarriage , in the 2nd trimester it can cause massive abnormalities or loss, and in the 3rd trimester usually non lifethreatening damage eg hearing loss.
I will say the chances of you contracting toxoplasmosis from that steak are very small. It probably wasn't contaminated anyway.
However, you can request a blood test to check whether you are already immune to it (in which case panic over), or whether you have an infection.
Remember, even if you have an infection, it doesn't mean it will certainly be transmitted to your baby. You baby is not currently hooked up with a cord or placenta yet so probably pretty unaffected by what's going on in your body.
And also, if you are unlucky enough to have a miscarriage, it is hugely unlikely to be due to toxoplasmosis, it was probably on the cards anyway so please please please don't blame yourself.
For future, toxo sources include rare/raw meat, cat faeces, soil, unwashed fruit & veg (esp from your garden if cats ever go in it). Washing and cooking thoroughly will make it safe - it dies at about 70C.
And if you have had toxo before (and you probably wouldn't have noticed, it's so mild and undangerous to non pregnant people) then you have life long immunity. My consultant spoke to the UK expert on toxoplasmosis to clarify that about the immunity to reassure me.
I hope everything is fine, I'm sure it will be. I'm sorry you've had such a fright.