Yes I did when I was taking UB and I did not know why it was doing that either. 
But I can say I didn't like the feeling, the first time I felt rapid heart beat I didn't care much but as months passed by it started to feel weird, like at some point I thought or felt my heart would skip a beat and had a fear that it would stop beating. I went to the hospital for another problem I had, but got a heart scan and pulse monitoring thing done and the doctor clearly saw that my heart would race up for sometimes and then it would be gone or go back to normal... I didn't tell them I was taking UB but for some reason I knew it was the UB. I have stopped taking UB since, it has been well over 6 months now. Since I stopped the UB pills I haven't got that weird rapid heartbeat or skipping a beat? lol kind of thing.
But I can say I didn't like the feeling, the first time I felt rapid heart beat I didn't care much but as months passed by it started to feel weird, like at some point I thought or felt my heart would skip a beat and had a fear that it would stop beating. I went to the hospital for another problem I had, but got a heart scan and pulse monitoring thing done and the doctor clearly saw that my heart would race up for sometimes and then it would be gone or go back to normal... I didn't tell them I was taking UB but for some reason I knew it was the UB. I have stopped taking UB since, it has been well over 6 months now. Since I stopped the UB pills I haven't got that weird rapid heartbeat or skipping a beat? lol kind of thing.