Ovarian Cysts!! 6weeks preg!

marybeth • Mommy of 3 soon :)
i have a cysts the size 6.82cm
​it actually got bigger then the other day  when i got my ultrasound.
​im 6weeks pregnant.
​my doc checked if my baby was fine and we seen the heartbeat.
​i took over 4 bloodtest all together.
​they said everything is fine, im not anic my pregnancy level is good. and everything
​but why n how i got this cysts?'
​doc said not to have sex more then a week.