Round Ligament Pain - Too Early?

Hi ladies! I'm 5 weeks and 3 days and I habe a weird pain (not excruciating, just severely annoying) that runs from from side of my stomach to my groin, and its more pronounced in the groin area. I figured this could be round ligament pain but it's so early?? I've been cramping so I know my body is growing and making room for baby. I figured it could very well be RLP because this is my second child and I hear you feel it more and the aches and pains get a little worse. Thoughts? I have an appt on Monday for an ultra sound to make sure there's no funny business going on. I'll be just about 6 weeks.