Someone please help & try to give me advice. I had sexual intercourse the beginning of may and I got my period on the first of the month then when I had sexual intercourse that was on the 8th I think and it's been about 3 weeks maybe going on 4. Threw out this time I have been experincing pregnancy symtoms fatigue,nausea,sore breast &swollen,back achs,mild cramps as if I was Geting my period. I never experience any of these symtoms when my period comes just the day I get it. So I was more then likely sure I was pregnant I had sexual intercourse with my boyfriend again (twice) & when I got up I felt dizzy & light headed as if I was going to faint I have never in my life experienced this. A couple days passed after that and I started bleeding on the 27th it was a light pink then turned brown and stopped the next day then a couple hours later I started bleeding really heavy as if it was my period. If anyone can please try to give me some advise of what you guys think is going on I can't really go to the dr because I don't want my family to know anything of what's going on untill I know I'm pregnant for sure a lot of online websites have said its normal to bleed in the first trimester or after intercourse because the cervix collects blood or something.. I'm not sure if I should take a test because I'm scared to see a negative. Please give me advice

Thanks.. Best wishes to the moms expecting