By Joel Leaver Megan McKenna has updated fans on her pregnancy, including having teased that it has felt like she’s had a “hangover” despite not having consumed any alcohol. The singer-songwriter, 31, and her fiancé Oliver Burke, 26, announced on social media earlier this month that they are expecting a baby together. The couple shared the news with their respective followers on Instagram in a joint post. Following the news just weeks ago, Megan – who has been on shows like the Only Way is Essex and Celebrity Big Brother \- has shared various updates. She recently told fans that she had a urin…