Lower back pain dpo 3 and after

Nicole
Hi,
I have a slight pain in my lower back since dpo3. DH and I did some baby dancing on day before and on ovulation day! 
Wondering if I pulled an muscle while Ttc or is it some baby dust signal? Don't want to over-think but the slight lower back ache doesn't let me forget. 
Anybody with similar symptoms?? My next cycle is due on May14th.