Im Really Confused TTC

Im Hopeing Really Hard Tht I Get pregnant soon me and and my boyfriend have been ttc for a month now we had sex on March 4 he cumed i top of my private part and we had sex on March 16 and 18. On the 16 he cummed inside of me an on the 18 he cummed twice. Its been a week and ive been getting alot of cramps. Im suppose to get my period this up coming weekend (its march 24 today). I took a pregnancy test today (march 24) and came back positive. Should i wait 2 more weeks? And why am i haveing sooo much cramps if anybody can help plss:/