Pregnancy question.... NEED HELP

My husband and I have been TTC for 2 1/2 years... my OBGYN suggested that I get on BC since I had never taken it before, so I recently just stopped it before my last period. I was active with my husband almost everyday while ovulating..... I have 2 daughters already 3 and 10. My question is I am having back pains, frequent urinaton, headaches, cramping, and constipation..... has anyone else had the same thing? And found out they were pregnant? I have a good feeling i could be pregnant as I have never felt like this before, but I don't want to get excited either! PLEASE HELP!