SOS need advice. should I call dr?

Hello ladies. I am currently 16w5d with baby number 2. I've been experiencing very sharp admiral pains in my right lower/abdomen. If you were to put you left hand on your belly button and then take riffly 2-3 " finger steps" that's where the pain is located. I know of growing pains and I'm think that's what it probably is but I've also notice an increase in CM and feel slightly faint. Also could be from the heat ( has been high 90s last couple of days) I'm just concerned by the pain. It woke me up this morning ( 6:30am) and has been constant all day. ( it is now almost 8:30) every time I inhale sharply or if I'm laying on my back and reach to my left it intensifies. Also a concern at my last ultrasound my amniotic fluid was somewhat low. They reassured me that it's ok and that hopefully by next visit there will be more. I've added an attach photo of my ultra sound to see how low my fluid is. Any advise would be welcomed. Thank you ladies.