Should I buy a test?!?

Kaylee
So, my ex and I had sex quite a few times, each unprotected but he would pull out each time. I am on birth control and have been for a little over a year and take it around the same time each night. 
My concern is my period was two days late, I had my period for four days then it stopped. Now I am having cramps and back aches. Last time we had sex was September 2 and I had my period Sept.26-Oct.2. Could I be preganant?! Or are the cramps ovulation?  
I am having occasional white creamy discharge. 
Please help! 

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