Had mid cycle bleeding/spotting 10 days before actual due P. Lasted 5 days. Why? And will I still get my scheduled period in a few days?

Likely. It is very likely that you just have had a one time hormonal 'blip". If you don't get you regular period or " rescheduled" period counting from that one "mid circle one" , I'd recommend you to be seen by your regular doctor ( better, if it is GYN and not general practitioner )