symptoms of quitting birth control or pregnancy?

Tina
 My last period began on jan 2 and ended the 8th. Five days later on the 13th I decided to quit birth control. The day before I got off birth control, I had sex and my husband came in me. On the 18th, I had thick discharge that was dark brown. This lasted for a few days and then went away. ( throughout this time I continued to have sex but we used condoms.) on the 23rd, we had unprotected sex and he came in me and we have been unprotected since then. I have not had my period yet. My question is how likely I am to be pregnant since I just got off of birth control. Also should I go ahead and test since it is four weeks since my last period, or should I base it off of when I got off of birth control? I know that it can take up to 4-6 weeks to get your period ofter quitting birth control. I forgot to mention that throughout this time I have been dizzy off and on, lightheaded, my stomach hurts, I have loose stool,  and my hips, legs, and butt have been aching off and on.