Symptoms

I've been ttc for about 4 months and I posted about 9 days ago that I was experiencing some intense cramps in my pelvic area on my left side and was trying to figure out if it was ovulation pain or something else. Well for a couple of days now I've been having pains in my breasts and light lower cramping, something I have never experienced since having my son almost 2yrs ago. I took a pregnancy test the other day and it was negative. Could I be pregnant but it's too early? or could it be my period coming back?