I was on a thrush website this morning, just looked it up again for you and it says this - Pregnancy and breastfeeding
Pessaries and creams are not well absorbed into the bodys circulation and are therefore unlikely to affect a developing foetus, but there has been little research into their use during pregnancy. Treatments with clotrimazole have been used by pregnant women for years and are considered safe. But iodine-based pessaries, such as betadine for recurrent thrush, should not be used during pregnancy. Some experts advise against using econazole during the first three months of pregnancy. If you are pregnant and have thrush, talk to your doctor or midwife about treatment.
Your baby is in your Uterus,and your Cervix is closed.Putting a Pessary in,with or without an applicator shouldn't be a problem.
If you touch the cervix with the tip you would know,it would be uncomfortable,but you'd have to be very rough to cause any contact damage,and still don't see how this could interfere with a pregnancy....