Do i tell the guy i could be pregnant??

My period is irregular. I had unprotected sex on the 16th. I am not on birth control but will be getting on it. I’ve spotted twice this month which never happened. Once before and after I got my 1st dose of moderna vaccine. Am I pregnant? Should I go test? Or wait one more week? It’s really hard for me to go get a test or birth control which is why it happened. Do I say anything to the guy I had sex with?? So scared and confused on what to do. Also yes I am over 18.

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