Leaking something tmi

I'm almost 21 weeks and there have been a few spots randomly though out the past 24 hours where there has been spots of wet on my undies. I dk if it's discharge, urine, or what. I didn't have this with my son so I'm not sure if it's normal. I have my anatomy scan and cervical length check today so I won't worry too much til then. And I go tomorrow for my weekly makena injection. Is this something I should call the dr about?