Anxiety about being pregnant

I absolutely hate this. A couple months ago the condom broke while my boyfriend and I were having sex, and even though I took plan B, I ended up getting pregnant. I had abnormal period and went to the doctor to get BC cause that couldn't happen again, but they told me it was positive.
Flash forward to present day. I have the Mirena IUD, after I got it I bled for a while, and has a normal period this month. Even though I had a normal period, I have taken about 10 pregnancy tests this month, not because of symptoms but just because I am so stressed about the possibility. I have the Mirena IUD and use condoms (have used the withdrawal method like 3 times) but still I am double protected. 
How do I help with this anxiety? I can't get over this? I will go on here and see others worry about being pregnant and make myself worry. I can keep spending so much money on pregnancy tests, but I don't know what else to do.
Help? 

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