Rest. Stay hydrated. And avoid heavy activity. if pain is constant and unbearable, you must visit the doc. At five weeks, such excess isn't always popular.

Its normal in general....But try soothing up with light massages....consult gynae...I tried mamaearth epsom bath salt...it helped relief much of such kindda pains....take iron calcium meds dosage as prescribed

<span style="color:#3B5998;"><b><a href="http://app.babychakra.com/article/3018">Backache During Pregnancy</a></b></span>

Pls go thru the article

Congratulations