How long did your period last? In normal circumstances, if it's 5 days then it'll be on your 8th day, and your ovulation should be around 14-15, so you'll be quite safe.

However, u've been bleeding the whole month! So that's VERY VERY wrong and I believe it is not a good idea to take the second pack! Clearly you're suffering the side effects of it, and you could possibly be very pale and anaemic now. So please get advice from a doctor or just stop the pills so you'll stop bleeding (just in case you bleed again, since you said you've stopped bleeding)

You're not suppose to bleed for 1 month while taking mercilon. In regards to your last sentence, I dont think you need to take ECP since you've been on mercilon for a month already.

using condom have 5% failure rate? ugh my my gf should have her period on 25th but now she missed it today is 3rd march that would be 6 day already I'll always use condom (extra safe!) guess not safe enough? or I'm one of those unlucky 5%? dam any idea what to do? she is freaking out now :-/