trying to become pregnant please read asap

may 12 thru may 15 my period was normal. i had sex unprotected may 17, 23, and 24. i ovulated may 26. ive had slight morning sickness. low back pain. and goin to the bathroom repeatedly. my period was due june 9th. didnt come. then all of a sudden it came june 20th and lasted 4 days. but it was strange not normal. i feel like something is inside me but i took a pregnancy test june 11th it was negative. what do i do??