Second AF in 10 days...wtf?!

Saf

Am a pretty regular 30 dayer, last AF was 7th November (now on cycle day 10) & about to get into my 'good week' and have been excited to try again this month (TTC number 2 for 8 months)...went to bed last night feeling bit sick with cramps, not unusual for me before ovulation. BUT this morning out of the blue, 'AF' rocked up again, only 5 days after it had ended?! It's heavier than spotting & bright red, so new blood...

Now my whole cycle is thrown out...anyone else had this mid-cycle bleed and what did this mean for ovulation that month?! HELP!