missed my period


my last period was 2/16/18 and was supposed to get my next period on the 20th and I'm never late. usually I'm on time or I start a few days early and now I'm 9days late and I took a pregnancy test and negative and my doctor took one Monday and negative. I went pee (tmi lol) this morning and I had a pinkish discharge and I thought I was starting and it was just when I whipped and a few minutes later I had to go to the bathroom again for the third time and nothing. We've been trying to conceive for a year and now I missed my period and getting our hopes up and were just waiting to see what we do next. has anyone experienced this?