The emotional roller coaster you’re on probably started early on in the first trimester, when your body was still getting used to the big adjustment that pregnancy is. Hormones were the main cause of your emotional outbursts, and they will stay that way throughout your pregnancy, and even afterwards.
In addition to all those extra hormones in your body, you’re probably tired, achy and under physical strain, so it’s perfectly understandable that you’re not likely to be the most rational person around right now.
Once you’ve realised that your sudden giggle fits, and just as sudden floods of tears are normal, it should be a lot easier to handle them. Make sure that your family and friends also understand that sometimes, you’re not reacting to them – you’re just reacting – and you should have at least some semblance of peace while you navigate the emotions of pregnancy.