Mine does it all the time. there called heart palputations. its from you heart working harder to pump blood around ur body.
It can be totally normal. Increased blood flow and the fact that your heart is pumping for 2. But, let your dr know. It is something to keep an eye on. Hope all is well :)
I have the same issue. Scared me the first few times it happened, especially since high blood pressure runs in my family. I was just told to monitor it and make sure it doesn't stay too high. Doc said if it stays too high for too long, to go to the ER.
I had that happen and my dr told me to up my fluids and cut out caffeine completely.