Pregnancy after failed IVF

Kia
I had a failed <a href="https://glowing.com/glow-fertility-program">IVF</a> cycle last month and now my period is 5 days late and I've been really nauseous.  I took a pregnancy test and it was negative but can it be too early to test? My cycles are very regular so I'm praying that it's pregnancy and not food poisoning.