Thanks to everyone for your opinion. It seems that the overwhelming opinion was to not take him to the doctor and wait and see.....well, what happened was in the early afternoon yesterday a few hours after I posted, his fever spiked to 102.5. I called our pediatrician then and asked if I could take him in only because I didn't want to get stuck in a situation where his fever kept going up and I would have to take him to a hospital in the middle of the night. Also, as a nervous first time mom, I thought better safe than sorry. Plus though I knew she would prescribe nothing more than paracetamol - I was worried that he could have some other kind of infection (ear infection or something else) that was causing him to have this fever so I wanted to make sure it wasn't anymore more serious. Plus as the day wore on yesterday, he became more tired and lethargic - very different from his usual bubbly bouncy self.
Anyways, our paediatrician checked him out and basically said that he probably just had a viral infection of some sort but that if his high fever continued, there is a possibility that he could have roseola, but that she wouldn't be able to confirm roseola until he actually had rashes appear (which happens after the fever is finished). So as some of you suggested, after confirming that he had nothing serious (i.e. no serious infections that could be diagnosed right away), she just prescribed paracetomal for low grade fever and nurofen for higher grade fever and sent us home.
I know that most of you would have not brought your child and probably think I wasted money by going...but it brought me some peace of mind as I was getting really worried that the fever was rising and it let me know that there was nothing seriously wrong. And also on the plus side, before I went to the doctor, I was giving our son orange flavoured paracetamol which he hated so much - everything time I gave it to him, he acted like I was torturing him. When I told the ped, she switched me to a strawberry flavoured one which though he still doesn't love, at least he doesn't spit out.
The paediatrician's nurses also called me this morning to check my son, which I thought was extremely nice of them. His fever continued as a low grade fever through the night and I've been giving him paracetamol. By this morning, he was feeling much better.....so I'm hoping that it's not roseola and that he will be all better by tonight!