Groin pain

Hi ladies! For the past few days I've had a groin in my pain similar to if I had recently been on a bicycle after a long break or what it feels like after a tough spinning class. Its now worse and hurts when I stand or walk. It's also become a bit more prominent as if there's pressure on my groin area. Does anyone know what this could be and if it's cause for alarm? I'm 26 weeks and baby is weighing 2.4 pounds /1.2 kilos. Thanks in advance!