I never wake up in the middle of the night because I felt like I need to poop but I can't poop :( sitting on a toilet for 15 mins now (tmi) it feels really uncomfortable. I am now 8dpo. Could it be one of the sympstoms? My stomach feels very hard and have pressure. Also, I had very bad backache last night. Did anyone have same sympstoms ? I still can't poop but I am having some spotting. Is this implantation bleeding?