I wouldn't panic, Depending on how fast you will use the Jam. My family love Jam and eat it pretty quickly. I made some blackberry and Logan Berry Jam on the weekend. I just rinse my jars and place them in the oven at 100 until they are dry and pour the jam straight in the jars while hot. This also prevents the jars cracking as the Jam and jars are around the same temperature. Never pour hot Jam into a cold jar. Then I cover with jam covers and place the lids on the jars. I have never had Jam go mouldy.
That's pretty much my standard recipe Amanda. I'd rather pay a bit more for the jam sugar and have a success.