Women can thank the soaring levels of hormones for this early-pregnancy symptom [source: Mayo Clinic]. Many frequently report that their breasts feel more tender, heavy or full as early as a couple of weeks after conception. This can be confused with premenstrual breast sensitivity. It doesn't help that your old bra starts feeling like a cross between a corset and a straitjacket.
The simple solution is to treat yourself to a shopping spree and invest in some comfortable new bras that will literally support you through the months to come. (Note to partners: Though budding breasts may be hard to resist, please remember to "handle with care.")