Pain at front of bump when walking even small journeys. I'm 21 weeks.

[YumLemonCheesecake]

Just wondered if anyone else had experienced this and has any advice?
It is a really weird aching painful pain, not muscle or ligaments etc, it doesn't happy every time I am walking but is becoming more frequent and unbearable. It's absolutely awful I was so active with my previous pregnancy but the thought of even little walks makes me worry.

This is my second pregnancy, I had nothing like this with my previous pregnancy.
I have an anterior placenta if that makes any difference?

Thanks to any one with any advice at all, I just thought I would ask you ladies before I bothered the midwives.

I get a pain in my bump quite often when walking, it's usually more to the right hand side and feels like a stitch, I just slow right now or stop for a couple minutes and it goes away.