Spotted as you described for first 4 months with my first. He's now a healthy 11 year old.
No spotting with my 2nd. I think it was because I was still nursing my 1st. 2nd is now healthy 9 year old boy.
Spotted 5 months with my 3rd. She's a healthy, bouncy 3 year old.
I know spotting can be nerve-wracking. Always get it checked out to make sure all is okay. By the time #3 came along, I knew what to expect so it was easier. Not easy, but easier than #1. Don't "overdo" things. Listen to your body. If you feel tired, REST! Whatever you have to do, do it. Some things that helped me rest/occupy the older ones with #2 & #3 were: videos, books, nap/quiet time, screwdriver (taking apart and putting together door knobs, etc. kept him occupied!), friends. I found that if I paid attention to what my body needed -- instead of what I thought needed to be done -- I was okay.
Take care of yourself!