Had Sex with my girlfriend, condom broke, pulled right out, HELP?!?!?!?

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Okay, so this is like the 3rd time its happened this month, everytime its happend i pulled out right away and didnt come, the first time, it was like 5 days into her period, and the second time, she wasnt ovulating and its only precum, i know you can still get pregnant that way but pre come doesnt last as long and its less likely to, i get that. but im scared now because i remember early in the week, she was ovulating and tonight she said that she doesnt think she still is, shes expecting her next period a little after the first week of february. When it broke tonight, it was round 2, and a brand new condom, we were about halfway done when she was on top and i realized itt broke, i pulled out immediately after and now we're just afraid of the possible pre come that may have gotten inside her, especially if shes ovulating which we dont know. she doesnt want to get plan B, please give me a reasonable answer, should i not worry as much? also, i know i should start buying new condoms and get her on that birth control haha. PLEASE HELP