I'm not sure if I am pregnant!?

[Reid1111]

I had the implanon implant put in April 2011, meaning it would run out April 2014 but I only had it removed last week (19th June), however I have had sex with my partner 4/5 times since April when my implant run out so could I be pregnant? I have a sensitive stomach so every so often I feel slightly nauseous but a couple of days ago I threw up 3 times (I never throw up) and my breasts feel sore and tender as well as being very tired - however I have heard some of this is side effects of the pill which I am now on, I'm very confused! Thank you in advance x