Chance of being pregnant again.. help !

So I’m two months postpartum and roughly 10 days ago my husband and I had unprotected sex but he pulled out ( it was a solid pull out I watched him cum in his hand) every other time we wore condoms and I just started the pill 5 days ago (were still using condoms with the pill) and I noticed some light cramping and assumed my first period might be coming. Then my husband says “hey you should get a pregnancy test to make sure your not pregnant from that one night” so I took a cheap one and got a faint line... is it possible it’s left over hormones? I haven’t had a period, I’m breastfeeding, and he pulled out... im freaking out because were not financially ready for another baby. He’s working today and has our car so I can’t get a test until he’s off and I’m super worried. Any tips? Or knowledge to share?

Thank you 😊