Pain in lower abdomen.. 23 weeks. Is it normal?

I have no idea if the pain I'm feeling is normal. It's in my lower pelvic area I think... honestly it's like right on my bikini area on top of the pubic bone I think. It is so painful, it's almost like a stretching pain. I'm assuming it's the baby growing and stretching and being super low, but it hurts to the point I can barely walk faster than a slow walk. Today I ran after a toddler at my daycare and it hurt so bad I had to sit down for awhile. It hurts more when I put pressure on my left foot for some reason. I'm going to my doctor on Monday but Im thinking it's nothing. Anyone experiencing this ?