Need Advise.

Good Morning ladies. I am past due on my period, only by a day, but these past few months have been spot on. My normal periods last around 6/7 days, last month I had a period for 12 days. I was supposed to start yesterday, I have no signs of period. I do have back pain, it’s not just a small back pain. This back pain hurts sooo BAD! I cannot walk after getting up from sitting down, and I cannot sit down with out going thru a lot of pain. The drive to work (50miles) was very painful. Any tips or hints as to what may be going on?

To add to this, I’ve been extremely moody lately. TTC for 3 years, no luck. I haven’t gone to to fertility treatments. TTC naturally basically.

Any tips or hints are welcome.