Help how far would i be ?

So March24th was my last period. It didn’t come for April at all i took a test and it came back positive; but my question is how far will i be?! Okay so after my ovulation last month i did blood work and it came back negative ( a week after ovulation) i tested maybe 2/3 weeks ago and it still came back negative. So would i have conceived this month or was it last month and it wasn’t showing up yet?