To the people giving the OP a hard time it’s worth remembering that A, this isn’t something the OP is wanting to know necessarily and B, it’s still highly unlikely that she is pregnant, no matter how much posters on this thread are telling her she must be.
OP, when I was TTC I I skipped a period and had all the (what I thought were) pregnancy symptoms. Nausea/sore boobs etc etc etc. I did several tests and they were all negative. Went to the GP and she said that sometimes it happens that way but that she was certain I was pregnant. Did a blood test, came back negative.
MN’ers on here told me that I was almost certainly pregnant because it happens all the time.
Almost to the day a month later I got my period.
It happens that way sometimes. As much as posters will tell you you must be pregnant, that with symptoms it’s a certainty and you have to test now to prove them right, it’s also not uncommon to skip a period for no apparent reason, even through stress for instance, which can be caused by e.g. oh, I don’t know, having to home school 4 kids.
Period symptoms are incredibly like pregnancy symptoms, sore boobs etc, bloating, and sometimes even if you skip a period your body will still release the correct hormones so you will get the symptoms.
Ignore the posters demanding you test now.
Your DH has had a vasectomy, while anything is possible the chances of you being pregnant 8 years on are vanishingly rare.