Please help, what are the chances I could be pregnant??? :(?

My period last month was on May 13th. I think my boyfriend and I had intercourse around twice or thrice since, and we always used condoms. My boobs started to get sore since 12th June (that's my usual PMS symptom but it normally starts sooner but off late that hasn't been the case). My lower abdomen's been hurting for a couple of days when I curl up or compress it in any way. I took a pregnancy test today early in the morning when I had to pee at like 4 or 5 AM.. The test was negative, thank God. My period hasn't come yet and I'm worried :(. What are the chances of me being pregnant? :( :(