i last had sex on 11th may while on holiday, i took my period on 2nd may but i got tablets from my doctor to stop them while i was away, on 11th may when i came home i stopped tablets and took period when i was home, i have then since had a period which i got on 11th june, but before this i have been very tired, feeling sick, constantly want to eat, very sore breasts and swollen stomach and sore back, is it possible to be pregnant, i have done test but was negative