Hello all I'm a bit confused

Naomi • Hello I`m Naomi, im 18 years old and I have scoliosis & me and my partner want to try for our first baby 👶🏼! 💕
I thought I was pregnant but I I've had some light bleeding then I it got heavier but now all of a sudden it has stopped? 
Does anyone think there is a chance I still could be pregnant or what else it could be?