I started a new bcp brand about a month ago, switched from Safyral (Version of Yaz) to Lo Loestrin Fe. I got my withdrawal bleed on Lo Loestrin FE on Saturday but it was very light and just spotting, and some brown spotting on Sunday. Barely soiling any pads, just some brown blood when I wiped. Is it possible to get a withdrawal bleed and be pregnant? My withdrawal bleeds on Yaz were never like this- they were usually heavier and lasted about 3-4 days. This was pretty much just one and a half days of spotting so I'm concerned that it could be implantation or pregnancy related. I take my pills every day within a 30 min timeframe. I've never missed a pill and when I switched I started the new pack of Lo Loestrin on the Sunday after my period, the same time I would've started a new Safyral pack. I took an HPT yesterday (Monday) two days after my period and it came back negative, but I've been urinating more than I ever have before without consuming any liquids so I'm scared it could be due to pregnancy.