Is it okay to let my one year old skip tea after his jabs?

He's had his 1 year jabs today. He had a big bowl of strawberry and banana weetabix before we left (like 2 weetabix, a whole banana and lots of strawberrys), and then for lunch he had cheese and avocado on toast with a kiwi and a yoghurt and ate most of it, left a few pieces of toast and some kiwi slices. But now it's tea time and he's refused everything. I gave him cottage pie to start with (his absolute favourite) and he wouldn't touch it at all so I thought maybe he just didn't want anything hot (he is sporting a mild fever, 38.2) so I made him a sandwich instead and he's refused that too. As a last resort I thought I'd give him another yoghurt but shocker he's not having any of that either. He has a bottle of milk just before bed, not sure if he'll take that yet but we'll see, am I okay to just let him be? I don't like the thought of him missing a meal but I'm just stressing him out by offering him stuff, and obviously he has eaten today so it's not as if he's completely empty