Could I be pregnant? Frequently asked question I know

[Jenlancaster]

Hey I'm 18 and I am currently on Dianette for my acne and contraception have being on it for a few months now. I had unprotected sex whilst on it and i didn't worry but i went on my 7 day break from my pill and i didn't come on it usually take roughly 2 days, i eventually came on and i know that should tell me i'm not pregnant but i am having all the symptoms of being pregnant; Tender breasts, mood swings, stomach cramps, i have also develpod thrush i read up on it and prenancy and anitbiotics are the main causes and i haven't been taking antibiotics and slightly i'm turning my nose up to foods that i used to love i am really worried and so if my boyfriend i thought i'd just ask on here before i rush out and get a pregnancy test.. also if i do get a pregnancy test when if the best time to try it and are they accurate enough?

Thank you