Is it worth me buying a pregnancy test?

Im 21..Ok so i had sex on the 6th Aug and went on holiday on the 9th aug for 2 weeks. But i shouldnt of come on my period until the 23rd aug, but i came on it half way through my holiday and it only lasted about 3 days and it wasnt that heavy.. which is really strange because im always usually on for 1 week. i feel... show more Im 21..Ok so i had sex on the 6th Aug and went on holiday on the 9th aug for 2 weeks. But i shouldnt of come on my period until the 23rd aug, but i came on it half way through my holiday and it only lasted about 3 days and it wasnt that heavy.. which is really strange because im always usually on for 1 week. i feel bloated, gas, need to poo everyday, got an increased appitite,tired, needing to urinate abit more than usual
Could i be pregnant or not.. is it too early to tell I dont know whether or not to take a test because ive had an early 'period' which only lasted 3 days so dont know whether or not to wait to see if i come on in a few days? I havent had any sore boobs which people say they get when they are pregnant but i get sore boobs when im due to come on and havent got sore boobs yet and i should be coming on in 3 days
Update: i was thinking of buying a pregnancy test today but not sure
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