been using a clearblue fertility monitor for a while now. cycle is all over the place but this month i ovulated the earliest i have ever done on day 18. its usually day 25-28 for me. we b danced like crazy. anyway from a week after ovulation i have started with terrible back ache tummy cramps and sore boobs, im moody too. im now day 28 since the start of af. ive done 4 early pregnancy tests. negative. should an early test have worked by now or is it still too early? is it just af on the way???