teen rant

I'm 17 (bf 16) and I have an iud. we have always used a condom but this time the condom broke and he came inside me. my period is 2 weeks late (this happened 3 weeks ago) and I'm terrified. if I'm pregnant, my mom will be so disappointed in me. I know I need to take a test to confirm but im so scared to even go out and buy one. I have nobody to talk to about this but my boyfriend and I just feel so alone. should I wait to see if I get my period or should I take a test?

edit to add: adoption/abortion will not be options for me