Conceiving

Today I was supposed to begin my period. I haven't had any of my premenstrual cramps like I usually get right when I get ready to come on. For the past two days I have been having a white milky discharge. And today, I've been peeing a lot more frequently . Sometimes I'll get full really fast when I eat. Or I won't really have a major appetite for anything. And I'm continuously nauseous. I took a pregnancy test yesterday but came back negative. My boyfriend and I have been trying since my period last month. Should I check again in the next few days?