IS THERE A POSSIBILITY I COULD BE PREGNANT?

Hey guys ..so my boyfriend and i have been trying to conceive for 3 months and I have been having weird things going on...2 months ago I was 4 days early and bled for 7 days in total only thing is give never been early and also haven't been stressed either but still put that down for a normal period. I always have had 28-29 day cycle and always been clock work...so expected my period the next month and was 5days late but only bled for about 2 and a bit days in total...2 weeks before bleeding I had left pelvic pain and just a lil sensitive boobs which I thought wouldn't be long until she arrived 5days late I bled and thought ok the painters are in lol..but only lasted for 2 and a bit days normal red healthy blood but after wards brown discharge which I thought that comes before the new blood which might not mean for everyone. I've noticed have been quite bloated ...i been very emotional lately and also breast are getting more sensitive and sometimes tingly and also been abit tired but not due on now for a another 19 days and it's been a week since I came off ..took a pregnancy test strip and negative but any suggestions and opinions and has anyone experienced that before and found out they are pregnant? I'm 24 and pretty healthy thanks