Info on implatation bleeding...?

First month really TTC (he works out of town ) and I'm currently 7 dpo and today had very very light pink on tissue only. (Btw I'm 41 and partner is 33.) Could this be implantation bleeding? Or AF is coming early? I had a slight dip in my temp this morning and am praying it goes back up tomorrow which would signify implantation bleeding as well, correct?

Any info would be greatly appreciated...i tried to search on here but information seems to be all over with no updates after finding out the cause. Thanks in advance 😊