Late period

First time I have ever had a late period. Had daily blood tests this month to check ovulation day (day 10), so menstruation should commence 14 days later (31/1). Nothing, nothing, nothing. 3 negative tests. Day 5 on missed period- woke up with cramps, and one hour later severe pain and bleeding. A early miscarriage. 1 in 4 preganancies result in misscarriage. Is my body finally trying to sort itself out? Will the next one stick? Did I drink to much alcohol at that party, or work too long and vigorously excercise too hard last week? Did I impair the formation/implantation process?