Please help

So I had my little boy back in June the first week I had not received my period I was breastfeeding for 2 months and stopped was not on any birth control me and hubby were using condoms we had an issue with the condom sept 15 and we had sex the 17 & 21 but used the pull out method I received my period sept 27 my ob had me do a blood exam on sept 27 and negative had an ultrasound sept 29 showed no signs of pregnancy so is that the okay to get my birth control or would you ladies wait a little longer I know the blood work would pick it up right away any input would be great thnks!!

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