TTC for 3 months

Hello,

We have been trying to conceive for about 3 months. I just got off birth control pills 3 months ago and have been getting my period every month on the 10th. As of now my period is 10 days late. I used a home pregnancy test the first day of my missed period and the test was negative. I had a blood test done on the 15th which was also negative. I have been having lower abdominal cramping and cramping in my lower back. Shooting pains in my breasts. And I’m tired all the time. I’ve been feeling muscle spasms or fluttering in the lower left side of my abdomen as well. And frequent urination. Not sure what’s going on. Any advice?