First Trimester Workouts?!

M? • TTC baby #1!
I really want to continue working out but I'm nervous to do anything strenuous.  Any suggestions on workouts that I can do during the first trimester?  Any websites or places I can find videos or articles??  I've tried YouTube and I found a few but some make me so nervous with the jumping jacks and the over exertion.  Maybe I'm being a paranoid mama? ?