Why is he stressing so much even though I took a plan B pill?

So me and my boyfriend had unprotected sex last weekend high af and I told him to finished in me... which he did (I don't even know what I was thinking), he knew I wasn't on birthcontrol. The next morning I bought a plan b and he watched while I took it just for his own peace of mind, after that everything seems fine... i was sooo wrong. Every few days he will call me wanting to know If I got my period and just venting about how we aren't ready for kids and how he doesn't want a kid right now, which I agree with yet he keeps calling me with the same concern over and over again and I don't really know what to say to him since he knows I've taken multiple pregnancy tests and all are negative... also no abnormalities at all... just a delayed period since I did in fact take a plan b. I honestly feel so pressured rn and even feel like he will leave me once my period shows up... anyways any advice as to why he's pushing this so hard?
Why is he stressing so much even though I took a plan B pill?
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