We have been trying for 8 months

I am 35 and my husband and I have been ttc sonce April. I was suppose to have started my period on Dec 7th but I am now 6 days late. My periods are always very regular and this is the first time I have ever been that late. I’ve taken two home tests both negative. I had a blood test done negative. I’ve been more tired, having headaches more often, some dizziness and a little nausea. Any chance I could still be pregnant? I’ve read so many different things.