Hiya ladies! 13 DPO HERE!

I’m pretty regular - my cycles are 26 days, I’m a 12-13 day luteal phase, my period averages 4 days, and I ovulate between the 13/14th day of my cycles every month.

I’m supposed to start my period today. Yesterday, I had a creamy pink spot in my underwear in the morning and just one more spot on a panty liner just before noon. This morning, I just have a little creamy pink/rust color spot and nothing else.

My lower back hurts, I’m cramping, boobs are full abs sore, and I have been nauseous on and off for the last few days, mostly yesterday afternoon.

What is happening? Am I pregnant?