could i be pregnant ?

hi i had my last period around 15th april and my boyfriend come home from working away 30th april - 4 th may we had unprotected sex a number of times. 3 days ago i got stomach ache and sore boobs i also feel bloated, 2 days ago i had a bit of brown blood then later that day red blood i have had some red blood everyday since usually on tissue after i been toilet but sometimes also at the bottom of the toilet sorry if to much info its not as heavy as my usual period. took a hpt yesterday which was neg was it to early to take a test i was on period around the 8th jan and feb and around 15th march aND april. could i still be preg thanks for any help xx