Heartbeat as indicator of pregnancy

Hi ladies!! I hace been TTC for about 4 cycles. This cycle I am feeling really different. I am currently 9DPO and this is what I have felt:

*1) I have been having shar stabbing pains at the sides of my uterus near my ovaries

*2) Last night (8DPO) I felt this weird tingly "pain" near my belly button (maybe implantation?)

*3) Today I have realised that my heart beat this cycle is higher than the same days of my last cycle. The photo shows from 2DPO to 9DPO. The top picture is last cycle and the bottom one is this cycle.

My heart beat is over 100bpm at times whilst resting and a few minutes after it's maybe 70bpm. I have no idea what is happening! Could be a sign of pregnancy??