Possibly pregnant?

So I was so sure I was going to get my bfp at the beginning of December but unfortunately my period came right on schedule, I've just ovulated and normally my breasts are sore and I'm bloated but not this time, I've been feeling sick most evenings for about 4 days (I'm never sick) actually been sick, I'm off food, not sleeping, grumpy and slight pains in my tummy (on and off) so I did a pregnancy test and of course it was negative, but something doesn't feel right, is there chance I could be pregnant but not producing enough hcg to show on a test?

I can't describe how I'm feeling but something's different, like o said I was so sure I was pregnant until my period came 🤷‍♀️