One sided pain doesn’t go away

Sandra • Mom to 👧🏾

I’m 18w4d. For the past 3 hours I’ve been feeling a little pain on the lower left abdomen. It feels like a short brief (less than a second) cramp on the same spot over and over. I feel it more when I lie down or sit, but when I’m standing I don’t feel it as much. What is it? Why doesn’t it go away? I’m not spotting or bleeding or feeling anything else unusual. Should I go to the Dr tomorrow morning?