Consult your gyno, but be aware they are giving cautious advice to protect you, your baby and their reputation.

FWIW, a woman and her partner completed a 100km organised ride last year while seven months pregnant. She rode right up to the birth. I rode past her climbing a hill a month after the century, and was surprised when I saw who it was. Her husband was waiting at the top of the hill. Everyone was fit and healthy at delivery.

The main concern for you appears to be your confidence in handling a bike. Riding in snow would seem an extraordinary event now North America is coming into spring. I don't think there is any point in saying that if you are riding in traffic be careful, because the same applies on shared pathways, or in your driveway.

When you feel you cannot ride confidently without an incident, that perhaps is the time to stop. Keep consulting your gyno in the meantime.