3 days late

Me and my boyfriend are TTC. I usually have a very regular cycle and am always on time. Now I'm three days late. My breast hurt worse than they ever have with AF and I've had very mild cramps. With AF, I have horrible cramps. I've felt nauseous in the mornings also. I took a test today and it was negative. Was three days late too early to test? I'm really hoping these symptoms aren't just in my head.