First 4 weeks spotting? HELP!

So we finally got pregnant! After I missed my period I took some tests that came out positive. My only symptoms right now is light cramping (like expecting a period) and sore breast but their only really sore at night when im sleeping and after I take off my bra.

Out of nowhere I started to spot yesterday. I thought that it could be normal so I didn’t worry too much. I wore a panty liner and there ended up being a little bit of brown discharge by the morning. Today I have been spotting still and at this point it’s freaking me out. Has anyone else have this issue in the beginning and turn out being okay? I have an ultra sound scheduled for tomorrow and more blood tests the day after