Help

I've been trying to conceive for 2 yrs now my period last month was weird and not usuall it was bright red and lasted only 5 days usually its7-8 and thick. Well this month I was 3 days late started brown spotting for 5days very lightly then turned bright red and runny lasted 4 days now it's been 3days and I'm still spotting Brown like mud but very light what could it be I've got backpain and I feel like urinating every cup of water I drink. Thanks in advance

Help