Recurrent low fever and slight throat ache?

I am a 32 year old female, who eats a bit of greens, does a bit of sport, and is an occasional smoker.

All through last year I had these symptoms coming back every month basically: low fever, between 98.6 - 99.5 Fahrenheit (or 37-37.5 Celsius), accompanied by a slight throat ache, the kind you get at the very beginning of a cold.

My normal body temperature has always been 97.7 (or 36.5), so even the increase is not that much, I completely feel it - I feel feverish, tired, dizzy, plus the throat ache, sometimes a light cough.

This year I only had it twice - once in January, once now. I thought it could be ovulation-related, but it is not every month, and not always in the same moment in relation to my period (and I'm on the pill, so I should be fairly regular).

I asked my physician about it, she said don't worry, sounds like nothing, and was surprised I was feeling it all together. Fact is, I do feel it, every single time my body temperature starts reaching 98.6 (37), I feel like crap, and I am very concerned about the recurrence.

The Internet just gives me scary answers, like AIDS, cancer, malaria, typhoid and the like. Any ideas out there? I don't have any other symptoms, except the recurrent low fever and slight throat ache. My general blood work came out OK, and I also got checked for breast and armpit nodes.

Many thanks in advance community, please only answer if you are qualified.