Postpartum sex

Me and my boyfriend just had sex I’m 6 weeks and 2 days postpartum I have my 6 week checkup tommrow we didn’t use protection because the condoms we got were irritating me he pulled out but we also used lube and because of the lube he couldn’t tell if any semen possibly got in me I had my postpartum period a week ago and I’m getting on the nexplonon implant tommrow is there any possible way if sperm did get in me that I could still get pregnant even though I’m getting the birth control implant tommrow ???