Baby number 2

Steph
Hi everyone.  I'm 4 weeks 4 days and havin a few worries wondering if anyone can help put my mind at ease. I've been having pinching type feelings - not painful but noticeable I've also been having back ache not enough to stop me moving about doing housework but again noticeable. My last pregnancy ended in miscarriage so I think that's made me a lot more anxious this time round. Just wondering if what I'm experiencing is normal or if I should be concerned.