Irrationally scared I'm pregnant (post vasectomy help!)

So my husband got a vasectomy last August bc we both agreed that our April 2022 baby was our 3rd and our last. He went back and did a semen sample in October and was told he had 0 sperm present so we had the all clear to no longer use alternative forms of birth control. There is an extremely low chance of the vans deferens reconnecting on their own but if they do I guess it's most likely to happen in the 1st year post vasectomy. So the past week our April baby has gotten a LOT more clingy and A LOT more protective and jealous of me and has done the old wives tale where he will get down on all 4s and look between his legs. Our dog has also gotten a lot more clingy to me as well and I mean he was like right up my butt the entire day yesterday! I have also been getting more migraines and have had times of nausea but it's random. It's still several days out till my next expected period and my cycles and ovulation has always been irregular so I'm kinda freaking out a little bit! My husband who has been 100% confident with the vasectomy said yesterday he thinks I need to "pee on a stick, our youngest and our dog is making him nervous".  I'm really hoping I'm just being paranoid and overthinking this because we are happy with the family we have but we agree we could never live with ourselves if I got an abortion, we've had that discussion many times before. Has any women on here had a SO that had a vasectomy that "failed"? I know if I turn out to not be pregnant I'm ordering a post vasectomy at home test from Amazon 🤣