My girlfriend started low birth control about 4 weeks ago, the

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My girlfriend started low birth control about 4 weeks ago, the day after she started taking the pill, we were fooling around and I put my dick inside her for like 5 seconds, I made sure there was no precum and she wasn't ovulating, any way, we had protected sex about 2 weeks ago, I used a condom and pulled out, then a 3 days later she said she had her first period on BC, I'm sure it wasn't implantation bleeding, she had a lighter period than usual and it was lasting about 6 days due to BC. She's shown no signs of pregnancy other than being emotional all the time, but she's always emotional all the time, plus BC makes it worse IMO. So what's your take on it? Should I buy a test? Or am I worried over nothing.