I'm out but still need some advice

RR • Together since 2009 | Married since 2014 | 3 M/C`s | MTHFR | Rainbow baby born 07/02/17💗 #2 Due 12/21/20!!
I tested yesterday at 11 dpo and it was negative, so I'm like 99% sure I'm out. But on 8 and 9 dpo I had a sharp pinch on my left side. No other symptoms, no sore boobs, I have a little more CM than I usually do before AF but something feels different down there... Could it be cyst?  Anyone have any ideas what symptoms for a cyst would be?