Will i know im pregnant soon?

My last period was june 4th thru around the 7th. i believe i have had implantation bleeding (but maybe not and just spotting) this past weekend on the 25th and 26th. i started birth control the 10th but i missed a ton of pills the first 2 weeks.... all together so far around 8 pills. my fiance and i did have unprotected sex almost every day this month.... but i hadnt been on birth control for a while and we just used the withdrawal method til now and i hadnt gotten (well stayed) pregnant. 2 miscarriges. we wouldnt mind having a child. he really wants one. so i was wondering if i did end up getting pregnant would i know for sure before the 10th of july? its his birthday and if we are pregnant then i wanna do something cute for him gift wise by telling him we're having a baby and suprising him. PLEASE HELP ME!!!