I've been having pain, usually when farting or pushing, in my lower abdomen. It almost feels like it's coming from my uterus/ovaries, but I've also been really constipated with very hard stools all week. My last bowel movement was 2 days ago and it was really hard. 

Can constipation cause pain in the lower abdomen? Or is this a sign ovarian cancer? The pain was been going on for about 4 days now and I'm scared to see a doctor because I'm afraid it could be serious because of my swollen lymph nodes. 

Another thing I'm worried about is appendicitis, but the pain hasn't been increasing at all and it's not unbearable. The only time it hurts is when I massage the area and when I push farts out.