Advice what should I do?

Ka

Hello, so I need some advice. I had a period within weeks of each other. One was 3 days which is normal and the other was 8 days. Not normal. During the 8 day period I had one day of dark flow and 3 days at the end of dark spotting. And cramps toward the end during my dark blood time. Which I usually only cramp the first day or so. We had sex a few days during ovulation period and on the starting day of my 8day period. I had more than normal blood clots and tampons were uncomfortable this time. Any time I wore a tampon I had pains in my abdomen area. We are trying to have a baby. Is any of this normal. I took a test before the 8 day period and it was negative but this is all different for me. I have had headaches and lower back pain almost Everyday since the 8day period. Any ideas what’s going on.