My lmp was 30th aug. I got brown discharge on 25th sep. The flow increased and color changed to red on 26th and 27th but then stopped on 28th. I have regular cycle and period lasts for 3-4 days. On 30th sep, I did beta hcg blood test whose value was 0.8. Why did my periods last for only 2 days and did I take beta have very early? Are there any chances of pregnancy?