running while pregnant

[simplyleah87]

I was training for a half marathon before I got pregnant, but now that I'm pregnant I think I'm going to run my 10k in november and then call it good for now
well I ran nearly 5 miles last night and felt crampy (pms trype cramps) nothing extremely painful and no spotting or anything.

is it normal to feel achy when you're pregnant after running?
I remember cramping with my son for a few months.

I know several of you ladies ran while pregnant and even did half marathons, so how much is too much?