Could I be pregnant ?

My last period started on April the 27th. I'm usually on for 5 days. It went off on May 1st. I haven't had my period yet. I due remember one day when I went to the bathroom and wiped there was light blood and I thought my period was about to come on but it never did. I feel like I been gaining weight lately. I feel really bloated and I get real nausea . I feel real sick after I eat anything and sometimes throw up a little. I feel like I just ate a big meal and my stomach is so full it's poked out. That's how I feel. I just feel real uncomfortable. I was wondering should I take a pregnancy test or wait. Sometimes my period is on time sometimes it's a little late like 2 or 3 days maybe 5 but I'm thinking it shld a been on by now. I have been having sex but I been using the pull out method. I'm only 23 and just not ready for a baby now.