How many days of a high temp will possibly mean I am pregnant?

I have been doing the basal thing. I noticed that I had a drop then a nice rise in temp. in which from my understanding means that I had ovulated. Now that means that I ovulated on the 11 day of my cycle. Since the dip in which has been 3 days now my temp has cont. to remain in the 98's and before it remained in the low 97's. I would like someones insight on this. Thanks a bunch Kie