symptoms

hi everyone!! My boyfriend and I have decided to TTC and I officially went off my BC in December. So my period is supposed to be on Friday however the last couple weeks I have been getting these dizzy spells where out of no where I will feel nauseous and faint. Along with that I have been having sever lower back pain along with slight breast pain mostly in my nipples. I have never had these dizzy spells in my life and now all of a sudden they come out of no where and I feel so sick when I get them. Has anybody ever experienced this and found out they were pregnant?