How many years ago were you diagnosed with gestational diabetes? I had a plate of chips, chicken, rice and half a glass of full fat fanta. Started my food at 12 and ended 12:50. I took BG test at 2:50 and it turned out to be 7.1. You think that's ok?
Well my eldest is 26 now so quite a long time ago. Who knows what my blood sugars were doing in the interim but I didn't have any of the classic symptoms so never went to get checked again til 2 years ago.
If you are stressed about it then the first thing to do is reduce your sugary foods and drink. If you have got diabetes or pre-diabetes then moving to a lower carbs higher fats diet is the best treatment anyway, along with losing weight which quite often naturally follows such a diet change. Ditch the Fanta for either a diet version or preferably just drink water. If you can take you baby out for a walk twice a day that will help you too as exercise even quite gentle exercise does wonders. If you can manage two 25 minute walks a day that's great but even 15 mins will help.
.Without knowing what your BG was before the meal you can't really say how big the rise was but 7.1 is not hugely high. But in that meal you had two portions of carbs, the chips and the rice. Did you really need both? Could you substitute veggies for one of those carb portions? Anything you can do to cut down on carbs and up your intake of green/leafy/above ground veggies in particular (which you can have smothered in butter as you will need to increase the fats to compensate for the decrease in carbs) will help to protect you against developing diabetes. It is a lifestyle change but once you've made it you wont regret it.
However do bear in mind that stress can increase BG levels and while you are stressing out about maybe having diabetes you are not really helping yourself. Take a few deep breaths and calm yourself. It's tough with a new baby but anything you can do to get some relaxation time for yourself will pay dividends. Please try not to stress. It is unlikely that you will have done any damage so far and making some small changes now in reducing carbs will mean you should never have to suffer any diabetes complications.
If it helps my mum wasn't diagnosed til her 70's but she has had none of the complications despite not being diagnosed until her fasting BG was over 8.0.