Help! My body hates me!

First month TTC and my body is playing tricks on me. I finished my period 4 days ago DF and I BD twice during these 4 days and I woke up this morning with spotting. It was red, so I assume it's fresh. Dull cramps and dull pain in lower back. I came off the pill at the end of September, early October. During the last couple months on the pill I had been having break through bleeding as well. Not sure what is going on. ?