Missed Period

Ok sooo it is almost Aug and I haven't had my period. I haven't had a full flow period like normally I would. I have been bleeding light on and off. And I only would see blood when I wiped. Or it would be like a brown or brownish pink... Need advice from the ladies. What do u think? Should I wait another week or go get a test? (Yes I had sex 3 times in my fertile week unprotected with my fiancé) but it hasn't been our first time and I use to still have a full period flow. Welp this time no flow at all.  Put on pad and no blood whatsoever. Help please.