I've Been Trying To Conceive For 5 Cycles. I'm Concerned

I've been trying to conceive for 5 cycles. I'm concerned that my temperature doesn't rise enough after ovulation. I do the ovulation predictor tests and my basal body temperature prior to a positive test is usually 97.7. After a positive test my temperature will rise to 97.90-98.05 F. Is this a large enough increase in temperatute? I have read that it should be at least 0.4 degrees F.