Could I be pregnant? Answers greatly appreciated!

Jené • 16; Pizza, wifi, music, & sleep.
 What are the chances that I am pregnant? I had sex on day 22 and I am currently on day 32. I am on the pill and have been for 3 months. 
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​ My boyfriend and I had sex last week on Sunday, and we successfully used the withdrawal method. I am worried about the possibility of his precum impregnating me. I am not ttc, and I am extremely worried. I am currently on the 4th sugar pill with absolutely no sign of pms or my period. The stress and anxiety is killing me, and I don't have access to a test. I really need reassurance and opinions!
​- Thanks ! x