Don't panic, dear. A little mild cramping is just your body adjusting to the pregnancy. But if the pain is intense or you feel dizzy, please call your doctor immediately for advice.
Yes, mild tugging or stretching pain is common early on. However, if the pain is sharp, one-sided, or accompanied by bleeding, you must contact your gynac right away to rule out any complications.
I had mild stomach pain early on too and my doctor said it's just implantation and stretching. Just make sure to get all your routine tests done, and tell your doctor if the pain becomes unbearable.
Mild cramping is quite normal as your uterus starts stretching to make space. But if you have severe pain or any spotting, please take a sick leave and consult your doctor immediately.