Period two weeks late

My last period was November 15th. My cycle is always regular and my period usually comes on average CD 24. Ranges from 21-25 days. I had some signs of PMS cramps (on Dec 1) a week before my period was due that’s how I’ve always known I was going to start. But a week after AF was due (Dec 15), I had really bad abdominal pains on my entire left side that lasted a few hours. Every test has been negative. I woke up this morning, CD 37, to some lower back pain and leg cramping which are still occurring. I didn’t confirm O this cycle because we had been moving and were waking up various times, but I did use an opk to predict and we did BD every other day. I just want to get a spontaneous BFP or start my damn period already… I was having such bad pains earlier that it felt almost as bad as the contractions I had when I was pregnant. I’m also extremely tired which isn’t usual since I get plenty of rest, but I had such vivid dreams last night.