Would Really Apreciate Some Suggestions on BBT and

Me and my fiance have had unprotected sex for the last four years that we've been together. This year we decided to give it a go and TTC. I started tracking my period and possible O day. Nothing happened. I seen the doctor and she told me i needed to be trying for over a year before being tested, to see if Im having issues. I seen another doctor and she advised me to start charting my BBT, that people are most likely to conceive within 3 months of trying when using BBT. Well it is my second month TTC with BBT and Ovulation Test. First month, was a no go. Im CD25 and 5 DPO, my temperatures last month are steady at 96 degrees when on my period and 97 degrees after-wards. This month everything was similar until this month three days ago. Saturday:97.47 ; Sunday:98.08 ; Monday:97.79 (a dip); and today Tuesday: 98.31 . Is this a good sign that implantation is occurring?? I have some mild cramping, frequent urination, restless. If i am not pregnant can anyone give me some advice on what worked for them. Thanks >:)