Help meeee

Hi all, just a quick check. Anybody here is preggy with #2? Currently my last period is 4th may. Checked with doc, he said test again in a week ( this was last week ) this week checked 3 times alreasy. Solid negative. Symptoms i had, on and off nausea, left breast on and off pain nipple area. Tummy on and off cramping. And yes, i am planning for #2. Idk if this is implantation cramps or, what but my period has been on time after 1st child birth. My discharge sometimes like watery yellowish. Any advices?