Oh, I had this right side pain and kept overthinking if it's ectopic pregnancy! It turned out to be just muscle stretching, but please don't take any risk and ask your doctor right away to be sure.
Please be very careful with one-sided pain in early pregnancy. It is very important to get a scan done by your doctor to ensure the pregnancy is in the right place. Please call your gynac.
I also feel random twinges on my right side while planning! But honestly, if you have already missed your period, you should definitely consult your doctor to find out the exact reason.
I've read that mild right side pain can be due to implantation, but if it is sharp or severe, it could be serious. Please check with your gynac once to stay safe.
It can be normal stretching, but because I had other health issues, my doctor always made me report any one-sided pain. Please consult your gynac to rule out any complications.