Very watery discharge and pinching type cramps!

Hey everyone so I'm 3 days away from my period supposedly. I'm ttc and had sex a lot before my fertile week/during fertile week and even after. I've taken pregnancy tests starting 5 days leading up to period and so far negatives. My question is I've started having really watery discharge and pinching type cramping. I'm sure I could still turn up pregnancy but has anyone experienced this? When did it start and did you end up pregnant? When did you receive BFP?? Thanks :)