Need some help!

Basically I've not been trying to have a kid but I do really want one. My boyfriend is not quite ready. I recently just went back on the pill and was on it for about 3 weeks and I forgot to take a pill and then had sex, then 3 days later got my period. But now it's nearly 4 weeks later and I'm not feeling to great, really tired, headaches and nausea. A lot of people suggest I could be pregnant but I don't wanna do a test as I could get myself too excited IF it is a positive. Can anyone help shed some light, can I be pregnant?