Ay, mama, baby's heart rate can vary depending on kung gaano kalaki na siya at anong stage ng pregnancy ka na, pero 185 bpm ay medyo mataas kaya best to ask your OB agad para ma-check properly, lalo na kung concerned ka! One of my mum friends had something similar at ang doctor lang talaga ang nakakapag-explain ng tama kung normal ba or kung kailangan ng follow-up. Don't worry too much, pero do get it checked, mas better na safe lang kaysa mag-alala lang sa bahay, diba?