Hello, Thanks for trusting us with your health concern. Lifting of heavy objects is to be avoided in pregnancy as it can lead to pressure on the uterus and thereby cause uterine irritability. Your symptoms suggest some muscle spasm over the abdomen. The nausea is likely to be due to the pain and so is perhaps the migraine. However, I would ask you to see your obstetrician for a proper evaluation to check if everything is fine. Please take adequate rest preferably in the left lateral position and maintain adequate hydration. Wish you safe motherhood.