So confused.

So me and my husband have been trying for about 7 months for our 2nd baby. The first I was on the pill and got caught at 6 months. But we are struggling this time. I was due on my period on 4th April and I have had no signs. I have had cramping, nausea, and generally feeling odd, I have took test every day since its been missed but negative. My last I didn't show up till about 3 weeks after missed period. Just confused I am regular 28 days being on only 4 days. Should I go for a blood test or wait. Please help