Implantation or period?

I have PCOS. One app says my period is due in 4 days, the other says it's due in three weeks. I have been waking up every single day really sick and I'm staying sick throughout the day. Last night I went out to dinner, and I could barely eat. I am bloated, tired, and hungry. I wake up with stomach pains and they last all day and night. I always feel like I have to throw up but nothing comes up. Could this be implantation or a start of a period? I have been having this pink stuff for 2 days now.