Can't tell if I am pregnant. Help??

Okay I am 23 years old. I had a baby 16 months ago. I poked holes in a condom some time in the beginning of June. I was late on one period but it eventually came but was not normal then I was late again by two days and it was really short like 2_3 days long. First day really heavy the rest barely anything. Been feeling sick and seen my stomach move like I am being kicked I don't know what to do please help.