To be pregos or to not to be..

Ok you guys for about 3 months going on 4 my husband and I have been trying to get pregnant.. my boobs have gotten bigger and I'm not sure if it's because of frequently having sex or what and I have gain weight people have been asking me If I'm pregnant and I just tell them I'm just fat with big boobs and butt 3 days ago I woke up with light pink blood in my under wear that would stop over a course of an hour it happen again the next day... my next scheduled menstrual cycle is Tuesday you guys am I pregnant should I take a pregnancy test or should I just wait it out just opinions and advices please