Phantom kicks?

So after i had my daughter phantom kicks have came in full affect. Litterly... But now its just way to often. I got on birth control, nexplanon. Well lately I have been getting then every night while I lay in bed an one night I just had my hand resting on my stomach an it litterly felt like a baby kicking. It was werid... Fast forward to tonight at work. I was just standing around an it felt like a huge movement in my pelvic area. I was able to feel it on the outside too. My question is why are they suddenly getting stronger.. I mean I know I'm not pregnant bc I was on my period when I got the nexplanon. I still somewhat bleed an spot every month so this is just taking me by suprise..

Sorry this is all over the place.