Scared to test

So after having protected sex during my fertility window a condom broke. I really wasn't worried about it cuz I thought hey I can go buy a plan b and I should be good. Unfortunately plan be wasn't in my budget seeing that all the money I had left was gas money to get back and forth to work and taking the kids to daycare. I didn't get paid until a week later by then it will be too late for plan b. So I literally just forgot about thinking it's a one in a million chance that I conceived. I can't use birth control I've been on five different types so my doctor recommended me to just use protection. My period is 3days late I've been having nausea and sore boobs for about 4 days now. Just need some words of encouragement please.