I am canning tomatoes for the first time. I was meticulous about everything. I blanched them, peeled them, sterilized the jars & lids, used lemon juice first. Wiped the jars clean. but I misunderstood the instructions about head space. I left 1/2 inch below the bottom tread, not the top of the jar. Now I am worried they won't be safe. They are still processing. What should I do?