41 and Pregnant

I'm 41 years old and have been physically active for quite some time. I mainly run. I found out I was pregenant at 4 weeks so I actually ran through the first month and didn't know it. Once it was confirmed that I was pregnant, I miscarried 6 months ago. I was told to stop working out all together for the first trimester. My question is, when I start working out again come the second trimester, will it affect me that I took off for 2 months. I know they say, if your were one that exercised before pregnancy it's ok to continue but how will it be now that I stopped.