22 weeks pregnant, low backache & lower abdominal pain. Babies heartbeat is good & 20week scan was normal. I also just feel unwell. Had flu 3days ago.

Need urine check. These symptoms certainly could all just be residual from a stomach "flu" you recently had, and if you weren't pregnant, I'd tell you to drink lots of fluids and rest. However, you have to pay attention to little hints while pregnant. Your body does not fight infections as well and is more prone to complications of routine illness. So backache, low abdominal pain - could be a UTI. Get checked today.