Should I stop worrying?

DH and I are TTC. My fertile window started yesterday. We did the BD on the 3rd, 4th, 7th, and 9th of this month. We BDed last night but got so burnt out that he couldn't finish. We want to take a break today (11th) and start up again tomorrow, but I'm worried that we'll miss our chance. Calculations say that I'm supposed to ovulate on the 13th. Took a clear blue digital ovulation test today and got a negative. My question is, should I stop worrying that we'll miss out window?